Guard the 'struct kmp_base_tas_lock' member fliping with macro __LP64__ instead of KMP_ARCH_PPC64.

Author: xingxue-ibm

openmp/runtime/src/kmp_lock.h

@@ -120,9 +120,9 @@ extern void __kmp_validate_locks(void);
 
 struct kmp_base_tas_lock {
   // KMP_LOCK_FREE(tas) => unlocked; locked: (gtid+1) of owning thread
-#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && KMP_ARCH_PPC64
-  // Swap the high and low 32-bit words to be consistent with the layout of
-  // a 64-bit address in big-endian.
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ && __LP64__
+  // Flip the ordering of the high and low 32-bit member to be consistent
+  // with the memory layout of the address in 64-bit big-endian.
   kmp_int32 depth_locked; // depth locked, for nested locks only
   std::atomic<kmp_int32> poll;
 #else