Compile implicit closures as dispatchers instead of duplicating the original method's code.

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 44558)
+++ runtime/vm/object.cc	(working copy)
@@ -6267,6 +6267,8 @@
   // Set closure function's end token to this end token.
   closure_function.set_end_token_pos(end_token_pos());
 
+  closure_function.set_is_debuggable(false);

[hausner, 2015/03/23 17:44:48]

Maybe add a comment that the non-closureized version of the function will be
called from this stub, and the function has debugging enabled.

[Florian Schneider, 2015/03/24 09:19:38]

Done.

+
   // Set closure function's formal parameters to this formal parameters,
   // removing the receiver if this is an instance method and adding the closure
   // object as first parameter.