PPC: Move hash code from hidden string to a private symbol

src/ppc/macro-assembler-ppc.cc

 // Copyright 2014 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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_PPC
@@ skipping 1204 matching lines @@
   xor_(t0, t0, scratch);
   // hash = hash * 2057;
   mr(r0, t0);
   slwi(scratch, t0, Operand(3));
   add(t0, t0, scratch);
   slwi(scratch, r0, Operand(11));
   add(t0, t0, scratch);
   // hash = hash ^ (hash >> 16);
   srwi(scratch, t0, Operand(16));
   xor_(t0, t0, scratch);
+  // hash & 0x3fffffff
+  ExtractBitRange(t0, t0, 29, 0);
 }
 
 
 void MacroAssembler::LoadFromNumberDictionary(Label* miss, Register elements,
                                               Register key, Register result,
                                               Register t0, Register t1,
                                               Register t2) {
   // Register use:
   //
   // elements - holds the slow-case elements of the receiver on entry.
@@ skipping 3288 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC