AOT: Single target stub.

runtime/vm/assembler_x64.cc

Index: runtime/vm/assembler_x64.cc
diff --git a/runtime/vm/assembler_x64.cc b/runtime/vm/assembler_x64.cc
index 74f0ece47c0c84998778529804a2df1febb6e8e3..48e2613ede234e7db956b4c79f41d337ea9d760d 100644
--- a/runtime/vm/assembler_x64.cc
+++ b/runtime/vm/assembler_x64.cc
@@ -3702,9 +3702,9 @@ void Assembler::LoadClassIdMayBeSmi(Register result, Register object) {
   // if it is a Smi, which will be ignored.
   LoadClassId(result, object);
 
-  movq(object, Immediate(kSmiCid));
+  movq(TMP, Immediate(kSmiCid));
   // If object is a Smi, move the Smi cid into result. o/w leave alone.
-  cmoveq(result, object);
+  cmoveq(result, TMP);
 }