[LLVMdev] llvm.atomic.barrier implementation

[Andrew Lenharth]

Attached is the target independent llvm.atomic.barrier support, as
 well as alpha and x86 (sse2) support.  This matches Chandler's
 definitions, and the LangRef patch will just restore that.  Non-sse2
 barrier will be needed, I think it is "lock; mov %esp, %esp", but I'm
 not sure.

 Any objections?  I'll take a hack at the front end support for
 __sync_synchronize after this goes in.


 Andrew
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