Revert of Remove SIMD.js from V8.

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 7fa8e3b60ea84bc2f69153d55ee5b2169a149f57..717dc73ab7989bbb6daf5164f321d01c65ba5c16 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -973,6 +973,9 @@
       // Call runtime on identical symbols since we need to throw a TypeError.
       __ cmpb(ecx, Immediate(SYMBOL_TYPE));
       __ j(equal, &runtime_call, Label::kFar);
+      // Call runtime on identical SIMD values since we must throw a TypeError.
+      __ cmpb(ecx, Immediate(SIMD128_VALUE_TYPE));
+      __ j(equal, &runtime_call, Label::kFar);
     }
     __ Move(eax, Immediate(Smi::FromInt(EQUAL)));
     __ ret(0);