276c702d8d
mainly involves removing all __CC_SUPPORTS___INLINE__ ifdefs. These ifdefs are even less needed for amd64 than for i386, but the i386 atomic.h never had them. The ifdefs here were just an optimization of obsolescent compatibility cruft (__inline) for a null set of compilers. I think null sets of compilers should only be supported in cases where this is more than an optimization, doesn't require extensive ifdefs, and only involves not-so-obsolescent compatibility cruft (plain inline here).
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