[es6] Tail calls support.

src/compiler/js-operator.cc

 // Copyright 2014 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/compiler/js-operator.h"
 
 #include <limits>
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
@@ skipping 34 matching lines @@
   return OpParameter<ConvertReceiverMode>(op);
 }
 
 
 ToBooleanHints ToBooleanHintsOf(Operator const* op) {
   DCHECK_EQ(IrOpcode::kJSToBoolean, op->opcode());
   return OpParameter<ToBooleanHints>(op);
 }
 
 
-size_t hash_value(TailCallMode mode) {
-  return base::hash_value(static_cast<unsigned>(mode));
-}
-
-
-std::ostream& operator<<(std::ostream& os, TailCallMode mode) {
-  switch (mode) {
-    case TailCallMode::kAllow:
-      return os << "ALLOW_TAIL_CALLS";
-    case TailCallMode::kDisallow:
-      return os << "DISALLOW_TAIL_CALLS";
-  }
-  UNREACHABLE();
-  return os;
-}
-
-
 bool operator==(BinaryOperationParameters const& lhs,
                 BinaryOperationParameters const& rhs) {
   return lhs.language_mode() == rhs.language_mode() &&
          lhs.hints() == rhs.hints();
 }
 
 
 bool operator!=(BinaryOperationParameters const& lhs,
                 BinaryOperationParameters const& rhs) {
   return !(lhs == rhs);
@@ skipping 931 matching lines @@
   return new (zone()) Operator1<Handle<ScopeInfo>>(               // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scpope_info);                                               // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8