A64: Synchronize with r18444.

src/a64/macro-assembler-a64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1766 matching lines @@
                                  Register result);
 
 
   // ---------------------------------------------------------------------------
   // Debugging.
 
   // Calls Abort(msg) if the condition cond is not satisfied.
   // Use --debug_code to enable.
   void Assert(Condition cond, BailoutReason reason);
   void AssertRegisterIsClear(Register reg, BailoutReason reason);
-  void AssertRegisterIsRoot(Register reg, Heap::RootListIndex index);
+  void AssertRegisterIsRoot(
+      Register reg,
+      Heap::RootListIndex index,
+      BailoutReason reason = kRegisterDidNotMatchExpectedRoot);
   void AssertFastElements(Register elements);
 
   // Abort if the specified register contains the invalid color bit pattern.
   // The pattern must be in bits [1:0] of 'reg' register.
   //
   // If emit_debug_code() is false, this emits no code.
   void AssertHasValidColor(const Register& reg);
 
   // Abort if 'object' register doesn't point to a string object.
   //
@@ skipping 399 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_A64_MACRO_ASSEMBLER_A64_H_