[ia32] Use Wasm SSSE3 codegen flag for checking SIMD support

Bug: v8:11154
Change-Id: I71d524bb33dbc2f7583da9a7d9dc2c350b57bf51
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2686680
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72645}

src/codegen/ia32/assembler-ia32-inl.h

@@ -49,7 +49,11 @@ namespace internal {
 
 bool CpuFeatures::SupportsOptimizer() { return true; }
 
-bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(SSE4_1); }
+bool CpuFeatures::SupportsWasmSimd128() {
+  if (IsSupported(SSE4_1)) return true;
+  if (FLAG_wasm_simd_ssse3_codegen && IsSupported(SSSE3)) return true;
+  return false;
+}
 
 // The modes possibly affected by apply must be in kApplyMask.
 void RelocInfo::apply(intptr_t delta) {

src/codegen/x64/assembler-x64-inl.h

@@ -19,7 +19,7 @@ bool CpuFeatures::SupportsOptimizer() { return true; }
 
 bool CpuFeatures::SupportsWasmSimd128() {
   if (IsSupported(SSE4_1)) return true;
-  if (FLAG_wasm_simd_ssse3_codegen) return true;
+  if (FLAG_wasm_simd_ssse3_codegen && IsSupported(SSSE3)) return true;
   return false;
 }