[llvm-commits] [patch] implement cmake LLVM_MULTITHREADED gcc atomic builtin checks.

[Xerxes Rånby]

cmake builds where missing checks for the GCC atomic builtins and thus
could not define LLVM_MULTITHREADED.
This in turn made llvm_start_multithreaded() fail when using cmake.

Ok to commit?

Cheers
Xerxes
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