Remove HCheckSmi, LCheckSmi and rename LCheckSmiAndReturn to LCheckSmi.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 084b088926271468a1823f7a4cfccd808b0c52bc..f1346d576323caeba83049e6a5d7aef3afcab75d 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2949,11 +2949,6 @@ HType HCheckNonSmi::CalculateInferredType() {
 }
 
 
-HType HCheckSmi::CalculateInferredType() {
-  return HType::Smi();
-}
-
-
 HType HPhi::CalculateInferredType() {
   HType result = HType::Uninitialized();
   for (int i = 0; i < OperandCount(); ++i) {
@@ -3651,12 +3646,6 @@ void HSimulate::Verify() {
 }
 
 
-void HCheckSmi::Verify() {
-  HInstruction::Verify();
-  ASSERT(HasNoUses());
-}
-
-
 void HCheckNonSmi::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());