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

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index ca0d2e94c08e3b5bdae24be13d9c6a3197715ddb..dc68371b90d736fc987ee0494f97051b8a928cf4 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -294,6 +294,8 @@ static void EmitIdenticalObjectComparison(MacroAssembler* masm,
   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));