Tag smi-constants as smi. This also fixes code that copies holes into arrays.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 575edc8b8555bf8bd5faaa2a70e9a170d5e31bcb..7973affdec115f83d185fa29c80d59648dce70f7 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -603,7 +603,7 @@ double LCodeGen::ToDouble(LConstantOperand* op) const {
 
 
 bool LCodeGen::IsInteger32(LConstantOperand* op) const {
-  return chunk_->LookupLiteralRepresentation(op).IsInteger32();
+  return chunk_->LookupLiteralRepresentation(op).IsSmiOrInteger32();
 }
 
 
@@ -2127,7 +2127,7 @@ void LCodeGen::DoBranch(LBranch* instr) {
   CpuFeatureScope scope(masm(), SSE2);
 
   Representation r = instr->hydrogen()->value()->representation();
-  if (r.IsInteger32() || r.IsSmi()) {
+  if (r.IsSmiOrInteger32()) {
     Register reg = ToRegister(instr->value());
     __ test(reg, Operand(reg));
     EmitBranch(true_block, false_block, not_zero);