Separated smi check from HBoundsCheck.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index dacdd5a02e7f7acbddd66d17ecf5d31045e74cac..dbd5892e51e64bbe49e029f61d4ec9dc66ea319d 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1824,6 +1824,16 @@ 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));