Expose SIMD.Float32x4 type to Javascript.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index e9b2e659a0adf3c6e3af2d46ace1c3a1328e3b26..30c2f082534a5d41af240afbf37422d4dbba43c4 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -1576,6 +1576,9 @@ void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
       // Call runtime on identical symbols since we need to throw a TypeError.
       __ cmpb(rcx, Immediate(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(rcx, Immediate(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.