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

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index 93839a49a80cab6c328e8f3b46ac94ace418ec86..92b207fe9ba33da918cc4fd67a73e4e18bd723f5 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -310,7 +310,7 @@ void Deoptimizer::TearDown() {
 
 
 unsigned Deoptimizer::GetOutputInfo(DeoptimizationOutputData* data,
-                                    unsigned id,
+                                    AstId id,
                                     SharedFunctionInfo* shared) {
   // TODO(kasperl): For now, we do a simple linear search for the PC
   // offset associated with the given node id. This should probably be