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

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index e3683c413c9dcde923d1575dccd72ebf82e22e1b..fb4480c9392cfe4e41cfd67106a82913afe37406 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -791,7 +791,7 @@ LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
 LInstruction* LChunkBuilder::SetInstructionPendingDeoptimizationEnvironment(
     LInstruction* instr, int ast_id) {
   ASSERT(instructions_pending_deoptimization_environment_ == NULL);
-  ASSERT(pending_deoptimization_ast_id_ == AstNode::kNoNumber);
+  ASSERT(pending_deoptimization_ast_id_ == kNoAstId);
   instructions_pending_deoptimization_environment_ = instr;
   pending_deoptimization_ast_id_ = ast_id;
   return instr;
@@ -800,7 +800,7 @@ LInstruction* LChunkBuilder::SetInstructionPendingDeoptimizationEnvironment(
 
 void LChunkBuilder::ClearInstructionPendingDeoptimizationEnvironment() {
   instructions_pending_deoptimization_environment_ = NULL;
-  pending_deoptimization_ast_id_ = AstNode::kNoNumber;
+  pending_deoptimization_ast_id_ = kNoAstId;
 }
 
 
@@ -1117,7 +1117,7 @@ LEnvironment* LChunkBuilder::CreateEnvironment(HEnvironment* hydrogen_env) {
 
   LEnvironment* outer = CreateEnvironment(hydrogen_env->outer());
   int ast_id = hydrogen_env->ast_id();
-  ASSERT(ast_id != AstNode::kNoNumber);
+  ASSERT(ast_id != kNoAstId);
   int value_count = hydrogen_env->values()->length();
   LEnvironment* result = new LEnvironment(hydrogen_env->closure(),
                                           ast_id,