MIPS: Remove HCheckSmi, LCheckSmi and rename LCheckSmiAndReturn to LCheckSmi.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 3743da4f0a12853317964f91800909f379809870..a6cb7577a5e78d3206b02352fa14eb97f2c44e80 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4947,13 +4947,6 @@ void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
 }
 
 
-void LCodeGen::DoCheckSmiAndReturn(LCheckSmiAndReturn* instr) {
-  LOperand* input = instr->value();
-  __ And(at, ToRegister(input), Operand(kSmiTagMask));
-  DeoptimizeIf(ne, instr->environment(), at, Operand(zero_reg));
-}
-
-
 void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
   LOperand* input = instr->value();
   __ And(at, ToRegister(input), Operand(kSmiTagMask));