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

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 49e23d7d26f32e6a1d17b504cba652090b050d7a..22adc2a2b4d263d8ed399a5343b0422446c5c4c1 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1778,8 +1778,7 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
       if (val->type().IsSmi()) {
         return DefineSameAsFirst(new(zone()) LDummyUse(value));
       }
-      return AssignEnvironment(
-          DefineSameAsFirst(new(zone()) LCheckSmiAndReturn(value)));
+      return AssignEnvironment(DefineSameAsFirst(new(zone()) LCheckSmi(value)));
     } else {
       ASSERT(to.IsInteger32());
       LOperand* value = NULL;
@@ -1886,12 +1885,6 @@ LInstruction* LChunkBuilder::DoCheckPrototypeMaps(HCheckPrototypeMaps* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
-  LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckSmi(value));
-}
-
-
 LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   return AssignEnvironment(new(zone()) LCheckFunction(value));