PPC [no-wasm]: disable Simd if WEBASSEMBLY is not enabled

Change-Id: I3cda4c4ac03a56191e4c034aef34879c23da993d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2876449Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#74421}

src/codegen/ppc/assembler-ppc.cc

@@ -57,6 +57,8 @@ static unsigned CpuFeaturesImpliedByCompiler() {
 bool CpuFeatures::SupportsWasmSimd128() {
 #if V8_ENABLE_WEBASSEMBLY
   return CpuFeatures::IsSupported(SIMD);
+#else
+  return false;
 #endif  // V8_ENABLE_WEBASSEMBLY
 }