Partial revert of "Next bunch of fixes for check elimination".

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index c928523f446fc6e17aebd70b7cf102990137a3cb..2d34056e7180e3c4450b843fdd5e11c4261b5c4c 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -1697,13 +1697,6 @@ void LCodeGen::DoConstantE(LConstantE* instr) {
 void LCodeGen::DoConstantT(LConstantT* instr) {
   Handle<Object> object = instr->value(isolate());
   AllowDeferredHandleDereference smi_check;
-  if (instr->hydrogen()->HasObjectMap()) {
-    Handle<Map> object_map = instr->hydrogen()->ObjectMap().handle();
-    ASSERT(object->IsHeapObject());
-    ASSERT(!object_map->is_stable() ||
-           *object_map == Handle<HeapObject>::cast(object)->map());
-    USE(object_map);
-  }
   __ Move(ToRegister(instr->result()), object);
 }