[LLVMdev] atomics

[Andrew Lenharth]

Attached is a patch to support atomic compare and swap, load add
store, and swap.  These I think should be a sufficient minimal set of
atomic intrinsics.

Only Alpha has codegen support for all intrinsics (hey, alpha has to
have something shiny and new occasionally).  X86 is a matter of
implementing the various xchange instructions and the lock prefix (by
someone more familiar with that .td file than me :) ).

I also attached the two testcases I've been using.

Andrew
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