Make subtype test stubs isolate-specific.

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
===================================================================
--- runtime/vm/isolate.h	(revision 40703)
+++ runtime/vm/isolate.h	(working copy)
@@ -146,6 +146,11 @@
   static intptr_t class_table_offset() {
     return OFFSET_OF(Isolate, class_table_);
   }
+  uword ClassTableAddress() {
+    return reinterpret_cast<uword>(this)
+        + Isolate::class_table_offset()

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

just add TableAddress() getter to ClassTable that is defined as &table_

there is already ClassStatsTableAddress there.

Then you can do isolate->class_table()->TableAddress().

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

Done.

+        + ClassTable::table_offset();
+  }
 
   CHA* cha() const { return cha_; }
   void set_cha(CHA* value) { cha_ = value; }