Revert of [crankshaft] Fixing ES6 tail call elimination.

src/crankshaft/lithium.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/lithium.h"
 
 #include "src/ast/scopes.h"
 
 #if V8_TARGET_ARCH_IA32
 #include "src/crankshaft/ia32/lithium-ia32.h"  // NOLINT
@@ skipping 490 matching lines @@
   info()->AbortOptimization(reason);
   status_ = ABORTED;
 }
 
 
 void LChunkBuilderBase::Retry(BailoutReason reason) {
   info()->RetryOptimization(reason);
   status_ = ABORTED;
 }
 
-LInstruction* LChunkBuilderBase::AssignEnvironment(LInstruction* instr,
-                                                   HEnvironment* hydrogen_env) {
-  int argument_index_accumulator = 0;
-  ZoneList<HValue*> objects_to_materialize(0, zone());
-  instr->set_environment(CreateEnvironment(
-      hydrogen_env, &argument_index_accumulator, &objects_to_materialize));
-  return instr;
-}
 
 LEnvironment* LChunkBuilderBase::CreateEnvironment(
     HEnvironment* hydrogen_env, int* argument_index_accumulator,
     ZoneList<HValue*>* objects_to_materialize) {
   if (hydrogen_env == NULL) return NULL;
 
   LEnvironment* outer =
       CreateEnvironment(hydrogen_env->outer(), argument_index_accumulator,
                         objects_to_materialize);
   BailoutId ast_id = hydrogen_env->ast_id();
@@ skipping 128 matching lines @@
 
 LPhase::~LPhase() {
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceLithium(name(), chunk_);
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8