Revert "Revert of [Atomics] Implement ldaxr/stlxr instructions in ARM64 simulator (patchset #8 id:1…

test/cctest/test-simulator-arm.cc

 // Copyright 2016 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 49 matching lines @@
   enum class Size {
     Byte,
     HalfWord,
     Word,
   };
 
   MemoryAccess() : kind(Kind::None) {}
   MemoryAccess(Kind kind, Size size, size_t offset, int value = 0)
       : kind(kind), size(size), offset(offset), value(value) {}
 
-  Kind kind;
-  Size size;
-  size_t offset;
-  int value;
+  Kind kind = Kind::None;
+  Size size = Size::Byte;
+  size_t offset = 0;
+  int value = 0;
 };
 
 struct TestData {
   explicit TestData(int w) : w(w) {}
 
   union {
     int32_t w;
     int16_t h;
     int8_t b;
   };
@@ skipping 294 matching lines @@
   CHECK_EQ(1, ExecuteMemoryAccess(isolate, &test_data, strex_w));
   CHECK_EQ(1, test_data.w);
 
   thread.Finish();
   thread.Join();
 }
 
 #undef __
 
 #endif  // USE_SIMULATOR