Revert r20476.

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 cb15e0d82f4872f7b3bbc1608cf5d49c90126f22..66c79d1d587c2cf1857789728993c87e2cc97f43 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2007,9 +2007,7 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
 
 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
   LOperand* value = UseAtStart(instr->value());
-  LInstruction* result = new(zone()) LCheckNonSmi(value);
-  if (!instr->value()->IsHeapObject()) result = AssignEnvironment(result);
-  return result;
+  return AssignEnvironment(new(zone()) LCheckNonSmi(value));
 }