Support symbol comparison in crankshaft.

src/x64/lithium-x64.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 62 matching lines @@
   V(CheckNonSmi)                                \
   V(CheckPrototypeMaps)                         \
   V(CheckSmi)                                   \
   V(ClassOfTest)                                \
   V(ClassOfTestAndBranch)                       \
   V(CmpID)                                      \
   V(CmpIDAndBranch)                             \
   V(CmpJSObjectEq)                              \
   V(CmpJSObjectEqAndBranch)                     \
   V(CmpMapAndBranch)                            \
+  V(CmpSymbolEq)                                \
+  V(CmpSymbolEqAndBranch)                       \
   V(CmpT)                                       \
   V(CmpTAndBranch)                              \
   V(ConstantD)                                  \
   V(ConstantI)                                  \
   V(ConstantT)                                  \
   V(Context)                                    \
   V(DeleteProperty)                             \
   V(Deoptimize)                                 \
   V(DivI)                                       \
   V(DoubleToI)                                  \
@@ skipping 564 matching lines @@
   LCmpJSObjectEqAndBranch(LOperand* left, LOperand* right) {
     inputs_[0] = left;
     inputs_[1] = right;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(CmpJSObjectEqAndBranch,
                                "cmp-jsobject-eq-and-branch")
 };
 
 
+class LCmpSymbolEq: public LTemplateInstruction<1, 2, 0> {
+ public:
+  LCmpSymbolEq(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(CmpSymbolEq, "cmp-symbol-eq")
+};
+
+
+class LCmpSymbolEqAndBranch: public LControlInstruction<2, 0> {
+ public:
+  LCmpSymbolEqAndBranch(LOperand* left, LOperand* right) {
+    inputs_[0] = left;
+    inputs_[1] = right;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(CmpSymbolEqAndBranch, "cmp-symbol-eq-and-branch")
+};
+
+
 class LIsNull: public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LIsNull(LOperand* value) {
     inputs_[0] = value;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(IsNull, "is-null")
   DECLARE_HYDROGEN_ACCESSOR(IsNull)
 
   bool is_strict() const { return hydrogen()->is_strict(); }
@@ skipping 1552 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::int
 
 #endif  // V8_X64_LITHIUM_X64_H_