Avoid HeapObject check in HStoreNamedField.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index a2d2280d2cc3e28823676ed0a638fae9f7957f69..9f10b82b415761bac08b8b1f834461c2684479d7 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -55,6 +55,11 @@ void MacroAssembler::Store(Register src, const Operand& dst, Representation r) {
   } else if (r.IsInteger16() || r.IsUInteger16()) {
     mov_w(dst, src);
   } else {
+    if (r.IsHeapObject()) {
+      AssertNotSmi(src);
+    } else if (r.IsSmi()) {
+      AssertSmi(src);
+    }
     mov(dst, src);
   }
 }