Plumb get/set prefixes for builtins

spec.html

@@ -8591,7 +8591,7 @@ <h1>[[Construct]] ( _argumentsList_, _newTarget_ )</h1>
     </emu-clause>
 
     <emu-clause id="sec-createbuiltinfunction" aoid="CreateBuiltinFunction">
-      <h1>CreateBuiltinFunction ( _steps_, _length_, _name_, _internalSlotsList_ [ , _realm_ [ , _prototype_ ] ] )</h1>
+      <h1>CreateBuiltinFunction ( _steps_, _length_, _name_, _internalSlotsList_ [ , _realm_ [ , _prototype_ [ , _prefix_ ] ] ] )</h1>
       <p>The abstract operation CreateBuiltinFunction takes arguments _steps_, _length_, _name_, and _internalSlotsList_ (a List of names of internal slots) and optional arguments _realm_ and _prototype_. _internalSlotsList_ contains the names of additional internal slots that must be defined as part of the object. This operation creates a built-in function object. It performs the following steps when called:</p>
       <emu-alg>
         1. Assert: _steps_ is either a set of algorithm steps or other definition of a function's behaviour provided in this specification.
@@ -8604,7 +8604,10 @@ <h1>CreateBuiltinFunction ( _steps_, _length_, _name_, _internalSlotsList_ [ , _
         1. Set _func_.[[Extensible]] to *true*.
         1. Set _func_.[[InitialName]] to *null*.
         1. Perform ! SetFunctionLength(_func_, _length_).
-        1. Perform ! SetFunctionName(_func_, _name_).
+        1. If _prefix_ is not present, then
+          1. Perform ! SetFunctionName(_func_, _name_).
+        1. Else,
+          1. Perform ! SetFunctionName(_func_, _name_, _prefix_).
         1. Return _func_.
       </emu-alg>
       <p>Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation.</p>
@@ -24712,13 +24715,14 @@ <h1>ECMAScript Standard Built-in Objects</h1>
   <p>Unless otherwise specified every built-in function and every built-in constructor has the Function prototype object, which is the initial value of the expression `Function.prototype` (<emu-xref href="#sec-properties-of-the-function-prototype-object"></emu-xref>), as the value of its [[Prototype]] internal slot.</p>
   <p>Unless otherwise specified every built-in prototype object has the Object prototype object, which is the initial value of the expression `Object.prototype` (<emu-xref href="#sec-properties-of-the-object-prototype-object"></emu-xref>), as the value of its [[Prototype]] internal slot, except the Object prototype object itself.</p>
   <p>Built-in function objects that are not identified as constructors do not implement the [[Construct]] internal method unless otherwise specified in the description of a particular function.</p>
-  <p>Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation (<emu-xref href="#sec-createbuiltinfunction"></emu-xref>). The values of the _length_ and _name_ parameters are the initial values of the *"length"* and *"name"* properties as discussed below.</p>
+  <p>Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation (<emu-xref href="#sec-createbuiltinfunction"></emu-xref>). The values of the _length_ and _name_ parameters are the initial values of the *"length"* and *"name"* properties as discussed below. The values of the _prefix_ parameter are similarly discussed below.</p>
   <p>Every built-in function object, including constructors, has a *"length"* property whose value is a non-negative integral Number. Unless otherwise specified, this value is equal to the number of required parameters shown in the subclause headings for the function description. Optional parameters and rest parameters are not included in the parameter count.</p>
   <emu-note>
     <p>For example, the function object that is the initial value of the *"map"* property of the Array prototype object is described under the subclause heading &laquo;Array.prototype.map (callbackFn [ , thisArg])&raquo; which shows the two named arguments callbackFn and thisArg, the latter being optional; therefore the value of the *"length"* property of that function object is 1.</p>
   </emu-note>
   <p>Unless otherwise specified, the *"length"* property of a built-in function object has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.</p>
-  <p>Every built-in function object, including constructors, has a *"name"* property whose value is a String. Unless otherwise specified, this value is the name that is given to the function in this specification. Functions that are identified as anonymous functions use the empty String as the value of the *"name"* property. For functions that are specified as properties of objects, the name value is the property name string used to access the function. Functions that are specified as get or set accessor functions of built-in properties have *"get "* or *"set "* prepended to the property name string. The value of the *"name"* property is explicitly specified for each built-in functions whose property key is a Symbol value.</p>
+  <p>Every built-in function object, including constructors, has a *"name"* property whose value is a String. Unless otherwise specified, this value is the name that is given to the function in this specification. Functions that are identified as anonymous functions use the empty String as the value of the *"name"* property. For functions that are specified as properties of objects, the name value is the property name string used to access the function. Functions that are specified as get or set accessor functions of built-in properties and whose property keys are not Symbol values have *"get"* or *"set"* passed to the _prefix_ parameter when calling CreateBuiltinFunction.
+  <p>The value of the *"name"* property is explicitly specified for each built-in functions whose property key is a Symbol value. If such an explicitly specified value starts with the prefix *"get "* or *"set "* and the function for which it is specified is a get or set accessor function of a built-in property, the value without the prefix is passed to the _name_ parameter, and the value *"get"* or *"set"* is passed to the _prefix_ parameter when calling CreateBuiltinFunction.</p>
   <p>Unless otherwise specified, the *"name"* property of a built-in function object has the attributes { [[Writable]]: *false*, [[Enumerable]]: *false*, [[Configurable]]: *true* }.</p>
   <p>Every other data property described in clauses <emu-xref href="#sec-global-object"></emu-xref> through <emu-xref href="#sec-reflection"></emu-xref> and in Annex <emu-xref href="#sec-additional-built-in-properties"></emu-xref> has the attributes { [[Writable]]: *true*, [[Enumerable]]: *false*, [[Configurable]]: *true* } unless otherwise specified.</p>
   <p>Every accessor property described in clauses <emu-xref href="#sec-global-object"></emu-xref> through <emu-xref href="#sec-reflection"></emu-xref> and in Annex <emu-xref href="#sec-additional-built-in-properties"></emu-xref> has the attributes { [[Enumerable]]: *false*, [[Configurable]]: *true* } unless otherwise specified. If only a get accessor function is described, the set accessor function is the default value, *undefined*. If only a set accessor is described the get accessor is the default value, *undefined*.</p>