[openmp] Fix for 32-bit PowerPC (llvm#126412)

Author: brad0

openmp/runtime/src/kmp_platform.h

@@ -116,6 +116,7 @@
 #define KMP_ARCH_PPC64_ELFv2 0
 #define KMP_ARCH_PPC64_XCOFF 0
 #define KMP_ARCH_PPC_XCOFF 0
+#define KMP_ARCH_PPC 0
 #define KMP_ARCH_MIPS 0
 #define KMP_ARCH_MIPS64 0
 #define KMP_ARCH_RISCV64 0
@@ -164,6 +165,9 @@
 #define KMP_ARCH_PPC_XCOFF 1
 #undef KMP_ARCH_PPC
 #define KMP_ARCH_PPC 1
+#elif defined(__powerpc__) && !defined(__LP64__)
+#undef KMP_ARCH_PPC
+#define KMP_ARCH_PPC 1
 #elif defined __ARM64_ARCH_8_32__
 #undef KMP_ARCH_AARCH64_32
 #define KMP_ARCH_AARCH64_32 1

openmp/runtime/src/z_Linux_asm.S

@@ -2470,7 +2470,7 @@ __kmp_invoke_microtask:
 
 #endif /* KMP_ARCH_S390X */
 
-#if KMP_ARCH_ARM || KMP_ARCH_MIPS || KMP_ARCH_AARCH64_32
+#if KMP_ARCH_ARM || KMP_ARCH_MIPS || KMP_ARCH_PPC || KMP_ARCH_AARCH64_32
 #ifndef KMP_PREFIX_UNDERSCORE
 # define KMP_PREFIX_UNDERSCORE(x) x
 #endif