Factor out HSimulate::ReplayEnvironment.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 96fa71954e59a75591937e448f7e9f7da79d2317..3cab3fcff448e4e0b484c06144ba6af184e53b14 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -2424,19 +2424,7 @@ LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
 
 LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
   HEnvironment* env = current_block_->last_environment();
-  ASSERT(env != NULL);
-
-  env->set_ast_id(instr->ast_id());
-
-  env->Drop(instr->pop_count());
-  for (int i = instr->values()->length() - 1; i >= 0; --i) {
-    HValue* value = instr->values()->at(i);
-    if (instr->HasAssignedIndexAt(i)) {
-      env->Bind(instr->GetAssignedIndexAt(i), value);
-    } else {
-      env->Push(value);
-    }
-  }
+  instr->ReplayEnvironment(env);
 
   // If there is an instruction pending deoptimization environment create a
   // lazy bailout instruction to capture the environment.