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[OpenMP] libomp: disable definitions of 5.1 atomics for non-x86 arch

Authored by AndreyChurbanov on Oct 21 2021, 12:20 PM.



Declarations of 5.1 atomic entries were added under #if KMP_ARCH_X86 || KMP_ARCH_X86_64 in kmp_atomic.h, but definitions of the functions missed architecture guard in kmp_atomic.cpp.
As a result mangled symbols were available on non-x86 architecture. The patch eliminates these unexpected symbols from the library.

Also tests added in fixed to be skipped on non supported architectures in a separate NFC commit

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