Factor out HSimulate::ReplayEnvironment.

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 7c02a62c46f5ae21842edf1e6033d84afeaa5dd1..4ecea705cfd1f40359bb34a1a849d1a7297de32e 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -2435,8 +2435,7 @@ LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
 
 
 LInstruction* LChunkBuilder::DoCapturedObject(HCapturedObject* instr) {
-  HEnvironment* env = current_block_->last_environment();
-  instr->ReplayEnvironment(env);
+  instr->ReplayEnvironment(current_block_->last_environment());
 
   // There are no real uses of a captured object.
   return NULL;
@@ -2484,20 +2483,7 @@ 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(current_block_->last_environment());
 
   // If there is an instruction pending deoptimization environment create a
   // lazy bailout instruction to capture the environment.