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

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 3af72887e9fd434e1a1308a745451ef913199e75..e208ead3955ecd640fa7d19a22afa261c230582b 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -682,7 +682,7 @@ void OptimizedFrame::Summarize(List<FrameSummary>* frames) {
   ASSERT(frames->length() == 0);
   ASSERT(is_optimized());
 
-  int deopt_index = AstNode::kNoNumber;
+  AstId deopt_index = kNoAstId;
   DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index);
 
   // BUG(3243555): Since we don't have a lazy-deopt registered at
@@ -763,7 +763,7 @@ void OptimizedFrame::Summarize(List<FrameSummary>* frames) {
 
 
 DeoptimizationInputData* OptimizedFrame::GetDeoptimizationData(
-    int* deopt_index) {
+    AstId* deopt_index) {
   ASSERT(is_optimized());
 
   JSFunction* opt_function = JSFunction::cast(function());
@@ -786,7 +786,7 @@ DeoptimizationInputData* OptimizedFrame::GetDeoptimizationData(
       break;
     }
   }
-  ASSERT(*deopt_index != AstNode::kNoNumber);
+  ASSERT(*deopt_index != kNoAstId);
 
   return DeoptimizationInputData::cast(code->deoptimization_data());
 }
@@ -796,7 +796,7 @@ void OptimizedFrame::GetFunctions(List<JSFunction*>* functions) {
   ASSERT(functions->length() == 0);
   ASSERT(is_optimized());
 
-  int deopt_index = AstNode::kNoNumber;
+  AstId deopt_index = kNoAstId;
   DeoptimizationInputData* data = GetDeoptimizationData(&deopt_index);
 
   TranslationIterator it(data->TranslationByteArray(),