[crankshaft] Support ES6 tail call elimination.

src/arm64/macro-assembler-arm64.h

 // Copyright 2013 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.
 
 #ifndef V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 #define V8_ARM64_MACRO_ASSEMBLER_ARM64_H_
 
 #include <vector>
 
 #include "src/arm64/assembler-arm64.h"
@@ skipping 1148 matching lines @@
 
   // For every Call variant, there is a matching CallSize function that returns
   // the size (in bytes) of the call sequence.
   static int CallSize(Register target);
   static int CallSize(Label* target);
   static int CallSize(Address target, RelocInfo::Mode rmode);
   static int CallSize(Handle<Code> code,
                       RelocInfo::Mode rmode = RelocInfo::CODE_TARGET,
                       TypeFeedbackId ast_id = TypeFeedbackId::None());
 
+  // Removes current frame and its arguments from the stack preserving
+  // the arguments and a return address pushed to the stack for the next call.
+  // Both |callee_args_count| and |caller_args_count_reg| do not include
+  // receiver. |callee_args_count| is not modified, |caller_args_count_reg|
+  // is trashed.
+  void PrepareForTailCall(const ParameterCount& callee_args_count,
+                          Register caller_args_count_reg, Register scratch0,
+                          Register scratch1);
+
   // Registers used through the invocation chain are hard-coded.
   // We force passing the parameters to ensure the contracts are correctly
   // honoured by the caller.
   // 'function' must be x1.
   // 'actual' must use an immediate or x0.
   // 'expected' must use an immediate or x2.
   // 'call_kind' must be x5.
   void InvokePrologue(const ParameterCount& expected,
                       const ParameterCount& actual,
                       Label* done,
@@ skipping 1080 matching lines @@
 #error "Unsupported option"
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 #endif  // V8_ARM64_MACRO_ASSEMBLER_ARM64_H_