[es6] Fix symbol comparison on some architectures

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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 269 matching lines @@
   Register exp_mask_reg = t1;
 
   __ Branch(&not_identical, ne, a0, Operand(a1));
 
   __ li(exp_mask_reg, Operand(HeapNumber::kExponentMask));
 
   // 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) {
-    __ GetObjectType(a0, t0, t0);
     __ Branch(slow, greater, t0, Operand(FIRST_SPEC_OBJECT_TYPE));
     __ Branch(slow, eq, t0, Operand(SYMBOL_TYPE));
   } else {
-    __ GetObjectType(a0, t0, t0);
     __ Branch(&heap_number, eq, t0, Operand(HEAP_NUMBER_TYPE));
     // Comparing JS objects with <=, >= is complicated.
     if (cc != eq) {
     __ Branch(slow, greater, t0, Operand(FIRST_SPEC_OBJECT_TYPE));
+    __ Branch(slow, eq, t0, Operand(SYMBOL_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 5232 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64