Separated smi check from HBoundsCheck.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 37d83909a011afd4d859c1413275696fbebeca4e..7fdc58adcac219d368c971a54c700cb8a414ddf9 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1857,6 +1857,16 @@ LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoCheckSmiOrInt32(HCheckSmiOrInt32* instr) {
+  if (instr->representation().IsTagged() && !instr->type().IsSmi()) {
+    LOperand* value = UseAtStart(instr->value());
+    return AssignEnvironment(new(zone()) LCheckSmi(value));
+  } else {
+    return NULL;
+  }
+}
+
+
 LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
   // If the target is in new space, we'll emit a global cell compare and so
   // want the value in a register.  If the target gets promoted before we