Restore back pointer from Instructions to Code

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 3e1083a052844c4b8da2f8dd2e5e1d5e35cf4ce0..9b5a28c0fdad870521a3ccb3c02e4d8c53e2f96a 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -3714,6 +3714,8 @@ class Instructions : public Object {
  public:
   intptr_t size() const { return raw_ptr()->size_; }  // Excludes HeaderSize().
 
+  RawCode* code() const { return raw_ptr()->code_; }

[rmacnak, 2015/09/29 16:50:12]

ASSERT(!Dart::IsRunningPrecompiledCode());

[Cutch, 2015/09/29 23:24:29]

Done.

+
   uword EntryPoint() const {
     return reinterpret_cast<uword>(raw_ptr()) + HeaderSize();
   }
@@ -3752,6 +3754,10 @@ class Instructions : public Object {
     StoreNonPointer(&raw_ptr()->size_, size);
   }
 
+  void set_code(RawCode* code) const {
+    StorePointer(&raw_ptr()->code_, code);
+  }
+
   // New is a private method as RawInstruction and RawCode objects should
   // only be created using the Code::FinalizeCode method. This method creates
   // the RawInstruction and RawCode objects, sets up the pointer offsets