Don't adopt the AST id from previous if id is none, since previous may have mismatching expected st…

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index ceedafc091ad5544b16aa076d8289323f96c9d1f..2253a0c3574cda1a918f732df372eea73a8c4c28 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2595,9 +2595,6 @@ void HPhi::AddIndirectUsesTo(int* dest) {
 
 
 void HSimulate::MergeWith(ZoneList<HSimulate*>* list) {
-  if (!list->is_empty() && !HasAstId()) {
-    set_ast_id(list->last()->ast_id());
-  }
   while (!list->is_empty()) {
     HSimulate* from = list->RemoveLast();
     ZoneList<HValue*>* from_values = &from->values_;