[es6] [interpreter] Add tail calls support to Ignition.

test/unittests/interpreter/bytecode-array-builder-unittest.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/v8.h"
 
 #include "src/interpreter/bytecode-array-builder.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "test/unittests/test-utils.h"
@@ skipping 83 matching lines @@
   builder.CreateClosure(shared_info, NOT_TENURED);
 
   // Emit literal creation operations.
   builder.CreateRegExpLiteral(factory->NewStringFromStaticChars("a"), 0, 0)
       .CreateArrayLiteral(factory->NewFixedArray(1), 0, 0)
       .CreateObjectLiteral(factory->NewFixedArray(1), 0, 0);
 
   // Call operations.
   builder.Call(reg, other, 1, 0)
       .Call(reg, wide, 1, 0)
+      .TailCall(reg, other, 1, 0)
+      .TailCall(reg, wide, 1, 0)
       .CallRuntime(Runtime::kIsArray, reg, 1)
       .CallRuntime(Runtime::kIsArray, wide, 1)
       .CallRuntimeForPair(Runtime::kLoadLookupSlotForCall, reg, 1, other)
       .CallRuntimeForPair(Runtime::kLoadLookupSlotForCall, wide, 1, other)
       .CallJSRuntime(Context::SPREAD_ITERABLE_INDEX, reg, 1)
       .CallJSRuntime(Context::SPREAD_ITERABLE_INDEX, wide, 1);
 
   // Emit binary operator invocations.
   builder.BinaryOperation(Token::Value::ADD, reg, Strength::WEAK)
       .BinaryOperation(Token::Value::SUB, reg, Strength::WEAK)
@@ skipping 546 matching lines @@
     iterator.Advance();
   }
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kReturn);
   iterator.Advance();
   CHECK(iterator.done());
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8