Do not emit receiver map in CheckPrototypes.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 346d5e805d17f3fe7375641411647f5d1ecd0b07..1e6dc9a5b9e54ea4c487c58de638a08dcd87f3d2 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -774,9 +774,6 @@ Register StubCompiler::CheckPrototypes(Handle<HeapType> type,
                                        Label* miss,
                                        PrototypeCheckType check) {
   Handle<Map> receiver_map(IC::TypeToMap(*type, isolate()));
-  // Make sure that the type feedback oracle harvests the receiver map.
-  // TODO(svenpanne) Remove this hack when all ICs are reworked.
-  __ Move(scratch1, receiver_map);
 
   // Make sure there's no overlap between holder and object registers.
   ASSERT(!scratch1.is(object_reg) && !scratch1.is(holder_reg));