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

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c3958e2396848bc87a603b639aab13b42529c6e6..8aae6e4de2999734d80d737a778a99c995197407 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3987,7 +3987,7 @@ class SharedFunctionInfo: public HeapObject {
   // Lookup the bailout ID and ASSERT that it exists in the non-optimized
   // code, returns whether it asserted (i.e., always true if assertions are
   // disabled).
-  bool VerifyBailoutId(int id);
+  bool VerifyBailoutId(AstId id);
 
   // Check whether a inlined constructor can be generated with the given
   // prototype.