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

[AndreyChurbanov]

Summary

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 https://reviews.llvm.org/D110109 fixed to be skipped on non supported architectures in a separate NFC commit https://reviews.llvm.org/rG52f4922ebb7b.

[tianshilei1992]

LG

openmp/runtime/src/kmp_atomic.cpp

 }
 
 void __kmpc_atomic_end(void) {
   int gtid = __kmp_get_gtid();
   KA_TRACE(20, ("__kmpc_atomic_end: T#%d\n", gtid));
   __kmp_release_atomic_lock(&__kmp_atomic_lock, gtid);
 }
 
+#if KMP_ARCH_X86 || KMP_ARCH_X86_64
+
 // OpenMP 5.1 compare and swap
 
 /*!
 @param loc Source code location
 @param gtid Global thread id
 @param x Memory location to operate on
 @param e Expected value
 @param d Desired value
kmp_int64 __kmpc_atomic_val_8_cas_cpt(ident_t *loc, int gtid, kmp_int64 *x,
                                       kmp_int64 e, kmp_int64 d, kmp_int64 *pv) {
   kmp_int64 old = KMP_COMPARE_AND_STORE_RET64(x, e, d);
   KMP_ASSERT(pv != NULL);
   *pv = old == e ? d : old;
   return old;
 }
 
 // End OpenMP 5.1 compare + capture
+#endif // KMP_ARCH_X86 || KMP_ARCH_X86_64
 
 /*!
 @}
 */
 
 // end of file