Remove HCheckSmi, LCheckSmi and rename LCheckSmiAndReturn to LCheckSmi.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 7973affdec115f83d185fa29c80d59648dce70f7..4a0895f2897bc9a2ff52390cece64c92742c4a44 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -5687,13 +5687,6 @@ void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
 }
 
 
-void LCodeGen::DoCheckSmiAndReturn(LCheckSmiAndReturn* instr) {
-  LOperand* input = instr->value();
-  __ test(ToOperand(input), Immediate(kSmiTagMask));
-  DeoptimizeIf(not_zero, instr->environment());
-}
-
-
 void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
   LOperand* input = instr->value();
   __ test(ToOperand(input), Immediate(kSmiTagMask));