[PATCH] compiler-rt: C++11 atomic support porting to Darwin

[Nick Kledzik]

The attached proposed patch fixes two issues building lib/atomic.c for Darwin:
1) In Darwin/mach-o the symbol name for C functions has a leading underscore, so the #pragma redefine_extname needs to be changed to add the extra underscore.
2) The generic spin locks are specialized for Darwin platforms to use the OS supplied spin lock routines.

-Nick


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