Revert of Remove SIMD.js from V8.

src/x87/code-stubs-x87.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 774 matching lines @@
     __ j(equal, &generic_heap_number_comparison, Label::kNear);
     if (cc != equal) {
       __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
       __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
       // Call runtime on identical JSObjects.  Otherwise return equal.
       __ cmpb(ecx, Immediate(FIRST_JS_RECEIVER_TYPE));
       __ j(above_equal, &runtime_call, Label::kFar);
       // 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);
 
 
     __ bind(&not_identical);
   }
 
   // Strict equality can quickly decide whether objects are equal.
   // Non-strict object equality is slower, so it is handled later in the stub.
@@ skipping 3091 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87