[OpenMP][libomp] Fix compile errors with new KMP_HW_SUBSET changes

[jlpeyton]

Summary

Add missing guards around x86-specific code.

[sylvestre.ledru]

looks good to me. please land this asap as it is breaking arm64.
see:
https://github.com/llvm/llvm-project/issues/52668

[kaz7]

LGTM too. I can compile openmp for VE without errors after applying this patch.

[sylvestre.ledru]

I pushed it to unbreak the arm64 builds

[sylvestre.ledru]

it fixed the build issue!

openmp/runtime/src/kmp_affinity.cpp

if (core_level == level) {
         }
       }
     }
   }
 
   struct core_type_indexer {
     int operator()(const kmp_hw_thread_t &t) const {
       switch (t.attrs.get_core_type()) {
+#if KMP_ARCH_X86 || KMP_ARCH_X86_64
       case KMP_HW_CORE_TYPE_ATOM:
         return 1;
       case KMP_HW_CORE_TYPE_CORE:
         return 2;
+#endif
       case KMP_HW_CORE_TYPE_UNKNOWN:
         return 0;
       }
       KMP_ASSERT(0);
       return 0;
     }
   };
   struct core_eff_indexer {

openmp/runtime/src/kmp_settings.cpp

for (int j = 0; j < core_level; ++j) {
 
       if (offset_ptr) {
         offset = atoi(offset_ptr + 1); // save offset
         *offset_ptr = '\0'; // cut the offset from the component
       }
       if (attr_ptr) {
         attr.clear();
         // save the attribute
+#if KMP_ARCH_X86 || KMP_ARCH_X86_64
         if (__kmp_str_match("intel_core", -1, attr_ptr + 1)) {
           attr.set_core_type(KMP_HW_CORE_TYPE_CORE);
         } else if (__kmp_str_match("intel_atom", -1, attr_ptr + 1)) {
           attr.set_core_type(KMP_HW_CORE_TYPE_ATOM);
-        } else if (__kmp_str_match("eff", 3, attr_ptr + 1)) {
+        }
+#endif
+        if (__kmp_str_match("eff", 3, attr_ptr + 1)) {
           const char *number = attr_ptr + 1;
           // skip the eff[iciency] token
           while (isalpha(*number))
             number++;
           if (!isdigit(*number)) {
             goto err;
           }
           int efficiency = atoi(number);