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

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 58cde3b10a215a230565f776f36fc1a9eab0b784..62f54a06cb3de856daa61db3bd4bc6f551e576ef 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -6718,7 +6718,7 @@ static MaybeObject* Runtime_LazyRecompile(Arguments args) {
     function->ReplaceCode(function->shared()->code());
     return function->code();
   }
-  if (CompileOptimized(function, AstNode::kNoNumber)) {
+  if (CompileOptimized(function, kNoAstId)) {
     return function->code();
   }
   function->ReplaceCode(function->shared()->code());
@@ -6846,7 +6846,7 @@ static MaybeObject* Runtime_CompileForOnStackReplacement(Arguments args) {
     }
   }
 
-  int ast_id = AstNode::kNoNumber;
+  AstId ast_id = kNoAstId;
   if (succeeded) {
     // The top JS function is this one, the PC is somewhere in the
     // unoptimized code.
@@ -6867,12 +6867,12 @@ static MaybeObject* Runtime_CompileForOnStackReplacement(Arguments args) {
       // Table entries are (AST id, pc offset) pairs.
       uint32_t pc_offset = Memory::uint32_at(table_cursor + kIntSize);
       if (pc_offset == target_pc_offset) {
-        ast_id = static_cast<int>(Memory::uint32_at(table_cursor));
+        ast_id = static_cast<AstId>(Memory::uint32_at(table_cursor));
         break;
       }
       table_cursor += 2 * kIntSize;
     }
-    ASSERT(ast_id != AstNode::kNoNumber);
+    ASSERT(ast_id != kNoAstId);
     if (FLAG_trace_osr) {
       PrintF("[replacing on-stack at AST id %d in ", ast_id);
       function->PrintName();
@@ -6889,7 +6889,7 @@ static MaybeObject* Runtime_CompileForOnStackReplacement(Arguments args) {
         PrintF("[on-stack replacement offset %d in optimized code]\n",
                data->OsrPcOffset()->value());
       }
-      ASSERT(data->OsrAstId()->value() == ast_id);
+      ASSERT(static_cast<AstId>(data->OsrAstId()->value()) == ast_id);
       ASSERT(data->OsrPcOffset()->value() >= 0);
     } else {
       succeeded = false;