Revert "keep Apple Clang from optimizing this"

kernel/x86_64/sgemm_kernel_16x4_skylakex_3.c

@@ -1,6 +1,6 @@
-#if defined(__apple_build_version__) && __clang_major__ == 11 && __clang_minor__ == 0 && __clang_patchlevel__ == 3
-#pragma clang optimize off
-#endif
+//#if defined(__apple_build_version__) && __clang_major__ == 11 && __clang_minor__ == 0 && __clang_patchlevel__ == 3
+//#pragma clang optimize off
+//#endif
 
 
 /* %0 = "+r"(a_pointer), %1 = "+r"(b_pointer), %2 = "+r"(c_pointer), %3 = "+r"(ldc_in_bytes), %4 for k_count, %5 for c_store */