Separated smi check from HBoundsCheck.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 061a305354e4aafe4107a3a39dca8651692759a0..200d5f5e93da9f8812a72fc40a6b2a269366ba58 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -92,6 +92,7 @@ class LCodeGen;
   V(DeclareGlobals)                             \
   V(DeleteProperty)                             \
   V(Deoptimize)                                 \
+  V(DeoptimizeIfTaggedIsNotSmi)                 \
   V(DivI)                                       \
   V(DoubleToI)                                  \
   V(DummyUse)                                   \
@@ -2143,6 +2144,19 @@ class LCheckSmi: public LTemplateInstruction<0, 1, 0> {
 };
 
 
+class LDeoptimizeIfTaggedIsNotSmi: public LTemplateInstruction<0, 1, 0> {
+ public:
+  explicit LDeoptimizeIfTaggedIsNotSmi(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  LOperand* value() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(DeoptimizeIfTaggedIsNotSmi,
+                               "deoptimize-if-tagged-is-not-smi")
+};
+
+
 class LClampDToUint8: public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LClampDToUint8(LOperand* unclamped) {