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

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index a52f3c2ebe5a52f8c4a5732238deab88be9faead..fdd30ffd2663a90213845311959f449575a732f1 100755
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -58,7 +58,7 @@ CompilationInfo::CompilationInfo(Handle<Script> script)
       extension_(NULL),
       pre_parse_data_(NULL),
       supports_deoptimization_(false),
-      osr_ast_id_(AstNode::kNoNumber) {
+      osr_ast_id_(kNoAstId) {
   Initialize(NONOPT);
 }
 
@@ -72,7 +72,7 @@ CompilationInfo::CompilationInfo(Handle<SharedFunctionInfo> shared_info)
       extension_(NULL),
       pre_parse_data_(NULL),
       supports_deoptimization_(false),
-      osr_ast_id_(AstNode::kNoNumber) {
+      osr_ast_id_(kNoAstId) {
   Initialize(BASE);
 }
 
@@ -87,7 +87,7 @@ CompilationInfo::CompilationInfo(Handle<JSFunction> closure)
       extension_(NULL),
       pre_parse_data_(NULL),
       supports_deoptimization_(false),
-      osr_ast_id_(AstNode::kNoNumber) {
+      osr_ast_id_(kNoAstId) {
   Initialize(BASE);
 }
 
@@ -608,7 +608,7 @@ bool Compiler::CompileLazy(CompilationInfo* info) {
           // active as it makes no sense to compile optimized code then.
           if (FLAG_always_opt && !Debug::has_break_points()) {
             CompilationInfo optimized(function);
-            optimized.SetOptimizing(AstNode::kNoNumber);
+            optimized.SetOptimizing(kNoAstId);
             return CompileLazy(&optimized);
           } else if (CompilationCache::ShouldOptimizeEagerly(function)) {
             RuntimeProfiler::OptimizeSoon(*function);