Defer creating Handles for HConstants to the code generation phase.

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 c671e6d489c95e62d253105d86b26346054f2baa..002e78498680f6f134a81f49e93ba23d1613bc8c 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -538,8 +538,8 @@ void LChunk::AddGapMove(int index, LOperand* from, LOperand* to) {
 }
 
 
-Handle<Object> LChunk::LookupLiteral(LConstantOperand* operand) const {
-  return HConstant::cast(graph_->LookupValue(operand->index()))->handle();
+HConstant* LChunk::LookupLiteral(LConstantOperand* operand) const {
+  return HConstant::cast(graph_->LookupValue(operand->index()));
 }