Separated smi check from HBoundsCheck.

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 736890e6cd58d5c542acc36c9a4e542bd4b0d8ba..0df0d13355b38f1a2a111bab472b7642842096b0 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1729,6 +1729,16 @@ LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoCheckSmiOrInt32(HCheckSmiOrInt32* instr) {
+  if (instr->representation().IsTagged() && !instr->type().IsSmi()) {
+    LOperand* value = UseRegisterAtStart(instr->value());
+    return AssignEnvironment(new(zone()) LCheckSmi(value));
+  } else {
+    return NULL;
+  }
+}
+
+
 LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
   return AssignEnvironment(new(zone()) LCheckFunction(value));