- Get rid of RawClosure class and use RawInstance for closures.

vm/stub_code_x64.cc

Index: vm/stub_code_x64.cc
===================================================================
--- vm/stub_code_x64.cc	(revision 13487)
+++ vm/stub_code_x64.cc	(working copy)
@@ -1358,7 +1358,7 @@
     uword tags = 0;
     tags = RawObject::SizeTag::update(closure_size, tags);
     tags = RawObject::ClassIdTag::update(cls.id(), tags);
-    __ movq(Address(RAX, Closure::tags_offset()), Immediate(tags));
+    __ movq(Address(RAX, Instance::tags_offset()), Immediate(tags));
 
     // Initialize the function field in the object.
     // RAX: new closure object.
@@ -1410,8 +1410,6 @@
     __ movq(R10, Address(RSP, kTypeArgumentsOffset));
     __ movq(Address(RAX, Closure::type_arguments_offset()), R10);
 
-    __ movq(Address(RAX, Closure::smrck_offset()), raw_null);
-
     // Done allocating and initializing the instance.
     // RAX: new object.
     __ addq(RAX, Immediate(kHeapObjectTag));