Make subtype test stubs isolate-specific.

runtime/vm/assembler_arm.cc

Index: runtime/vm/assembler_arm.cc
===================================================================
--- runtime/vm/assembler_arm.cc	(revision 40703)
+++ runtime/vm/assembler_arm.cc	(working copy)
@@ -1728,25 +1728,23 @@
 }
 
 
-void Assembler::LoadClassById(Register result, Register class_id) {
+void Assembler::LoadClassById(Register result,
+                              Register class_id,
+                              Isolate* isolate) {

[Vyacheslav Egorov (Google), 2014/09/26 13:09:43]

Can we make isolate member of the assembler?

[Florian Schneider, 2014/09/26 14:05:02]

Yes, this would be a bigger change (since we should also replace all uses of
Isolate::Current in the assembler then. For now I'll use Isolate::Current
instead.

   ASSERT(result != class_id);
-  ldr(result, FieldAddress(CTX, Context::isolate_offset()));
-  const intptr_t table_offset_in_isolate =
-      Isolate::class_table_offset() + ClassTable::table_offset();
-  LoadFromOffset(kWord, result, result, table_offset_in_isolate);
+  LoadImmediate(result, isolate->ClassTableAddress());
+  LoadFromOffset(kWord, result, result, 0);
   ldr(result, Address(result, class_id, LSL, 2));
 }
 
 
-void Assembler::LoadClass(Register result, Register object, Register scratch) {
+void Assembler::LoadClass(Register result,
+                          Register object,
+                          Register scratch,
+                          Isolate* isolate) {
   ASSERT(scratch != result);
   LoadClassId(scratch, object);
-
-  ldr(result, FieldAddress(CTX, Context::isolate_offset()));
-  const intptr_t table_offset_in_isolate =
-      Isolate::class_table_offset() + ClassTable::table_offset();
-  LoadFromOffset(kWord, result, result, table_offset_in_isolate);
-  ldr(result, Address(result, scratch, LSL, 2));
+  LoadClassById(result, scratch, isolate);
 }