Expose SIMD.Float32x4 type to Javascript.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 7079dc9f775aed5079812e44e94203827066916f..e6403f8ec56c23e2c3d15a809b953ab15550bde6 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -1704,6 +1704,9 @@ void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
       // Call runtime on identical symbols since we need to throw a TypeError.
       __ cmpb(ecx, static_cast<uint8_t>(SYMBOL_TYPE));
       __ j(equal, &runtime_call, Label::kFar);
+      // Call runtime on identical SIMD values since we must throw a TypeError.
+      __ cmpb(ecx, static_cast<uint8_t>(FLOAT32X4_TYPE));
+      __ j(equal, &runtime_call, Label::kFar);
       if (is_strong(strength())) {
         // We have already tested for smis and heap numbers, so if both
         // arguments are not strings we must proceed to the slow case.