Move hash code from hidden string to a private symbol

src/arm64/macro-assembler-arm64.cc

 // 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 3910 matching lines @@
   // hash = hash + (hash << 2);
   Add(key, key, Operand(key, LSL, 2));
   // hash = hash ^ (hash >> 4);
   Eor(key, key, Operand(key, LSR, 4));
   // hash = hash * 2057;
   Mov(scratch, Operand(key, LSL, 11));
   Add(key, key, Operand(key, LSL, 3));
   Add(key, key, scratch);
   // hash = hash ^ (hash >> 16);
   Eor(key, key, Operand(key, LSR, 16));
+  Bic(key, key, Operand(0xc0000000u));
 }
 
 
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
                                               Register result,
                                               Register scratch0,
                                               Register scratch1,
                                               Register scratch2,
@@ skipping 1206 matching lines @@
   }
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64