Move hash code from hidden string to a private symbol

src/ia32/macro-assembler-ia32.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_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 1132 matching lines @@
   // hash = hash ^ (hash >> 4);
   mov(scratch, r0);
   shr(scratch, 4);
   xor_(r0, scratch);
   // hash = hash * 2057;
   imul(r0, r0, 2057);
   // hash = hash ^ (hash >> 16);
   mov(scratch, r0);
   shr(scratch, 16);
   xor_(r0, scratch);
+  and_(r0, 0x3fffffff);
 }
 
 
 
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
                                               Register r0,
                                               Register r1,
                                               Register r2,
@@ skipping 2059 matching lines @@
   if (mag.shift > 0) sar(edx, mag.shift);
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32