Revert of Remove SIMD.js from V8.

src/mips64/code-stubs-mips64.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_MIPS64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 215 matching lines @@
   // Test for NaN. Sadly, we can't just compare to Factory::nan_value(),
   // so we do the second best thing - test it ourselves.
   // They are both equal and they are not both Smis so both of them are not
   // Smis. If it's not a heap number, then return equal.
   __ GetObjectType(a0, t0, t0);
   if (cc == less || cc == greater) {
     // Call runtime on identical JSObjects.
     __ Branch(slow, greater, t0, Operand(FIRST_JS_RECEIVER_TYPE));
     // Call runtime on identical symbols since we need to throw a TypeError.
     __ Branch(slow, eq, t0, Operand(SYMBOL_TYPE));
+    // Call runtime on identical SIMD values since we must throw a TypeError.
+    __ Branch(slow, eq, t0, Operand(SIMD128_VALUE_TYPE));
   } else {
     __ Branch(&heap_number, eq, t0, Operand(HEAP_NUMBER_TYPE));
     // Comparing JS objects with <=, >= is complicated.
     if (cc != eq) {
       __ Branch(slow, greater, t0, Operand(FIRST_JS_RECEIVER_TYPE));
       // Call runtime on identical symbols since we need to throw a TypeError.
       __ Branch(slow, eq, t0, Operand(SYMBOL_TYPE));
+      // Call runtime on identical SIMD values since we must throw a TypeError.
+      __ Branch(slow, eq, t0, Operand(SIMD128_VALUE_TYPE));
       // Normally here we fall through to return_equal, but undefined is
       // special: (undefined == undefined) == true, but
       // (undefined <= undefined) == false!  See ECMAScript 11.8.5.
       if (cc == less_equal || cc == greater_equal) {
         __ Branch(&return_equal, ne, t0, Operand(ODDBALL_TYPE));
         __ LoadRoot(a6, Heap::kUndefinedValueRootIndex);
         __ Branch(&return_equal, ne, a0, Operand(a6));
         DCHECK(is_int16(GREATER) && is_int16(LESS));
         __ Ret(USE_DELAY_SLOT);
         if (cc == le) {
@@ skipping 3279 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64