22076249: Xcode 6.4: NS_INLINE functions called from Swift crash in Release builds

[openradar-mirror]

Description

Summary:
When calling a C function marked as NS_INLINE from Swift, the app crashes when built for Release. It doesn’t crash when built for Debug.

For example
NS_INLINE BOOL myInlineFunction(void) { return UIScreen.mainScreen.bounds.size.height == 568;}

Calling that from Swift leads to
2015-07-30 20:20:42.331 NSInlineWhizBang[82768:5412934] *** NSForwarding: warning: selector (0x1045ccbe2) for message 'mainScreen' does not match selector known to Objective C runtime (0x107d5d8f1)-- abort
2015-07-30 20:20:42.331 NSInlineWhizBang[82768:5412934] +[UIScreen mainScreen]: unrecognized selector sent to class 0x105b24310
2015-07-30 20:20:42.337 NSInlineWhizBang[82768:5412934] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[UIScreen mainScreen]: unrecognized selector sent to class 0x105b24310'

Steps to Reproduce:
Build & run the attached project in Release mode

Expected Results:
app runs

Actual Results:
app crashes

Regression:

Notes:
Can’t reproduce with Xcode 7.

Product Version: Xcode 6.4 (6E35b)
Created: 2015-07-30 18:27:13.142560
Originated: 2015-07-30T20:27:00
Open Radar Link: http://www.openradar.me/22076249