Move hash code from hidden string to a private symbol

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 3992 matching lines @@
   // hash = hash ^ (hash >> 4);
   movl(scratch, r0);
   shrl(scratch, Immediate(4));
   xorl(r0, scratch);
   // hash = hash * 2057;
   imull(r0, r0, Immediate(2057));
   // hash = hash ^ (hash >> 16);
   movl(scratch, r0);
   shrl(scratch, Immediate(16));
   xorl(r0, scratch);
+  andl(r0, Immediate(0x3fffffff));
 }
 
 
 
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
                                               Register r0,
                                               Register r1,
                                               Register r2,
@@ skipping 1069 matching lines @@
   if (mag.shift > 0) sarl(rdx, Immediate(mag.shift));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64