[es6] When comparing two symbols we may need to throw a TypeError

src/mips/code-stubs-mips.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_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 276 matching lines @@
 
   __ 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.
   if (cc == less || cc == greater) {
     __ GetObjectType(a0, t4, t4);
     __ Branch(slow, greater, t4, Operand(FIRST_SPEC_OBJECT_TYPE));
+    __ GetObjectType(a0, t4, t4);
+    __ Branch(slow, eq, t4, Operand(SYMBOL_TYPE));
   } else {
     __ GetObjectType(a0, t4, t4);
     __ Branch(&heap_number, eq, t4, Operand(HEAP_NUMBER_TYPE));
     // Comparing JS objects with <=, >= is complicated.
     if (cc != eq) {
     __ Branch(slow, greater, t4, Operand(FIRST_SPEC_OBJECT_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) {
@@ skipping 5187 matching lines @@
                            kStackUnwindSpace, kInvalidStackOffset,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS