swift234

stdlib: Explicitly disable inlining of _forceCreateUniqueMutableBuffer.

This function is on the slow path (unfortunately I could not use the _fastPath intrinsic, which would be a better alternative to @inline(never)).
The effect is that it keeps the calling functions (Array.append) small and lets the inliner inline the calling functions.

This change fixes the performance degradation of Ary/Ary2:
Ary: +53 @ -O, +40% @ -Ounchecked
Ary2: +32% @ -O, +20% @ -Ounchecked

Other improvements/degradations:
QuickSort: +21% @ -Ounchecked
Chars: +9% @ -O
CaptureProp: -13% @ -O
InsertionSort: -12% @ -Ounchecked
SwiftStructuresBubbleSort: -11% @ -Ounchecked



Swift SVN r24554