MIPS: Avoid HeapObject check in HStoreNamedField.

src/mips/macro-assembler-mips.cc

Index: src/mips/macro-assembler-mips.cc
diff --git a/src/mips/macro-assembler-mips.cc b/src/mips/macro-assembler-mips.cc
index 02d798cae379811ec82a74d28feedc53080390cb..d2fa8dec69e93c01d54e1308e4baa1b1e0740ee7 100644
--- a/src/mips/macro-assembler-mips.cc
+++ b/src/mips/macro-assembler-mips.cc
@@ -56,6 +56,11 @@ void MacroAssembler::Store(Register src,
   } else if (r.IsInteger16() || r.IsUInteger16()) {
     sh(src, dst);
   } else {
+    if (r.IsHeapObject()) {
+      AssertNotSmi(src);
+    } else if (r.IsSmi()) {
+      AssertSmi(src);
+    }
     sw(src, dst);
   }
 }