X87: Avoid HeapObject check in HStoreNamedField.

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 7baa659d014d79864d3da4946e887787e4b04e04..8d8876f1ddd0ee6fdde79ad89823104eb1279843 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.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);
   }
 }