Fixed issue in StoreNamedField codegen where integer32 constants were not converted to a smi.

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 de62e1fd3b4cde31d756b00611e83975fc236080..10a8aef999ef28061cf0c8e42c2c0650a5f39fda 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4264,15 +4264,15 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
   if (instr->value()->IsConstantOperand()) {
     LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
     if (IsInteger32(operand_value)) {
-      int const_value = ToInteger32(operand_value);
-      __ mov(FieldOperand(write_register, offset), Immediate(const_value));
+      // In lithium register preparation, we made sure that the constant integer
+      // operand fits into smi range.
+      Smi* smi_value = Smi::FromInt(ToInteger32(operand_value));
+      __ mov(FieldOperand(write_register, offset), Immediate(smi_value));
+    } else if (operand_value->IsRegister()) {
+      __ mov(FieldOperand(write_register, offset), ToRegister(operand_value));
     } else {
-      if (operand_value->IsRegister()) {
-        __ mov(FieldOperand(write_register, offset), ToRegister(operand_value));
-      } else {
-        Handle<Object> handle_value = ToHandle(operand_value);
-        __ mov(FieldOperand(write_register, offset), handle_value);
-      }
+      Handle<Object> handle_value = ToHandle(operand_value);
+      __ mov(FieldOperand(write_register, offset), handle_value);
     }
   } else {
     __ mov(FieldOperand(write_register, offset), ToRegister(instr->value()));