Runtime support for identity key paths. #18804
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These builtins don't need ownership tracking because they shouldn't ever appear in SIL. NFC
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Make sure the implementation can handle a key path with zero components by removing inappropriate assumptions that the number of components is always non-empty. Identity key paths also need some special behavior: - Appending an identity key path should be an identity operation for the other operand - Identity key paths have a `MemoryLayout.offset(of:)` zero - Identity key paths interop with KVC as key paths to `@"self"` To be able to exercise and test this behavior, add a `Builtin.identityKeyPath()` function and `WritableKeyPath._identity` accessor in lieu of finalized syntax.
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Make sure the implementation can handle a key path with zero components by removing inappropriate assumptions that the number of components is always non-empty. Identity key paths also need some special behavior:
MemoryLayout.offset(of:)zero@"self"To be able to exercise and test this behavior, add a
Builtin.identityKeyPath()function andWritableKeyPath._identityaccessor in lieu of finalized syntax.rdar://problem/40538312