In class Function replace current code field with current instruction field, that way we save one l…

runtime/vm/raw_object.h

Index: runtime/vm/raw_object.h
===================================================================
--- runtime/vm/raw_object.h	(revision 36916)
+++ runtime/vm/raw_object.h	(working copy)
@@ -612,7 +612,7 @@
   RawArray* parameter_types_;
   RawArray* parameter_names_;
   RawObject* data_;  // Additional data specific to the function kind.
-  RawCode* code_;  // Compiled code for the function.
+  RawInstructions* instructions_;  // Instructions of currently active code.
   RawCode* unoptimized_code_;  // Unoptimized code, keep it after optimization.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->unoptimized_code_);
@@ -844,6 +844,8 @@
   int32_t data_[0];
 
   friend class StackFrame;
+  friend class MarkingVisitor;
+  friend class Function;
 };
 
 
@@ -871,6 +873,8 @@
   friend class RawCode;
   friend class Code;
   friend class StackFrame;
+  friend class MarkingVisitor;
+  friend class Function;
 };