Refactor lithium CheckSmi instruction into two separate instructions CheckSmi...

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
===================================================================
--- src/x64/lithium-x64.h	(revision 7203)
+++ src/x64/lithium-x64.h	(working copy)
@@ -70,6 +70,7 @@
   V(CheckFunction)                              \
   V(CheckInstanceType)                          \
   V(CheckMap)                                   \
+  V(CheckNonSmi)                                \
   V(CheckPrototypeMaps)                         \
   V(CheckSmi)                                   \
   V(ClassOfTest)                                \
@@ -1707,20 +1708,21 @@
 
 class LCheckSmi: public LTemplateInstruction<0, 1, 0> {
  public:
-  LCheckSmi(LOperand* value, Condition condition)
-      : condition_(condition) {
+  explicit LCheckSmi(LOperand* value) {
     inputs_[0] = value;
   }
 
-  Condition condition() const { return condition_; }
+  DECLARE_CONCRETE_INSTRUCTION(CheckSmi, "check-smi")
+};
 
-  virtual void CompileToNative(LCodeGen* generator);
-  virtual const char* Mnemonic() const {
-    return (condition_ == zero) ? "check-non-smi" : "check-smi";
+
+class LCheckNonSmi: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LCheckNonSmi(LOperand* value) {
+    inputs_[0] = value;
   }
 
- private:
-  Condition condition_;
+  DECLARE_CONCRETE_INSTRUCTION(CheckNonSmi, "check-non-smi")
 };