RFC: Switch to ast ids (instead of positions) for type feedback.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 68c61b5cdb168aae904786d229da17e49046bf98..a6e925bbac58ca17f0ea6b091c9144186c247719 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -850,7 +850,7 @@ bool CompileLazyInLoop(Handle<JSFunction> function,
 }
 
 
-bool CompileOptimized(Handle<JSFunction> function, int osr_ast_id) {
+bool CompileOptimized(Handle<JSFunction> function, AstId osr_ast_id) {
   CompilationInfo info(function);
   info.SetOptimizing(osr_ast_id);
   bool result = CompileLazyHelper(&info, KEEP_EXCEPTION);