Remove unsupported Blink CPUs from CPU.h

Source/wtf/dtoa.cpp

 /****************************************************************
  *
  * The author of this software is David M. Gay.
  *
  * Copyright (c) 1991, 2000, 2001 by Lucent Technologies.
  * Copyright (C) 2002, 2005, 2006, 2007, 2008, 2010, 2012 Apple Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose without fee is hereby granted, provided that this entire notice
  * is included in all copies of any software which is or includes a copy
@@ skipping 95 matching lines @@
 #define Tiny1 1
 #define Quick_max 14
 #define Int_max 14
 
 #define rounded_product(a, b) a *= b
 #define rounded_quotient(a, b) a /= b
 
 #define Big0 (Frac_mask1 | Exp_msk1 * (DBL_MAX_EXP + Bias - 1))
 #define Big1 0xffffffff
 
-#if CPU(PPC64) || CPU(X86_64)
+#if CPU(X86_64)
 // FIXME: should we enable this on all 64-bit CPUs?
 // 64-bit emulation provided by the compiler is likely to be slower than dtoa own code on 32-bit hardware.
 #define USE_LONG_LONG
 #endif
 
 struct BigInt {
     BigInt() : sign(0) { }
     int sign;
 
     void clear()
@@ skipping 1178 matching lines @@
 {
     Vector<LChar> conversionBuffer(length);
     for (size_t i = 0; i < length; ++i)
         conversionBuffer[i] = isASCII(string[i]) ? string[i] : 0;
     return parseDouble(conversionBuffer.data(), length, parsedLength);
 }
 
 } // namespace Internal
 
 } // namespace WTF