Faster ascii string case conversion.

src/globals.h

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 171 matching lines @@
 const int kCharSize     = sizeof(char);      // NOLINT
 const int kShortSize    = sizeof(short);     // NOLINT
 const int kIntSize      = sizeof(int);       // NOLINT
 const int kDoubleSize   = sizeof(double);    // NOLINT
 const int kPointerSize  = sizeof(void*);     // NOLINT
 const int kIntptrSize   = sizeof(intptr_t);  // NOLINT
 
 #if V8_HOST_ARCH_64_BIT
 const int kPointerSizeLog2 = 3;
 const intptr_t kIntptrSignBit = V8_INT64_C(0x8000000000000000);
+static const uintptr_t kUintptrAllBitsSet = V8_UINT64_C(0xFFFFFFFFFFFFFFFF);
 #else
 const int kPointerSizeLog2 = 2;
 const intptr_t kIntptrSignBit = 0x80000000;
+static const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;
 #endif
 
 // Mask for the sign bit in a smi.
 const intptr_t kSmiSignMask = kIntptrSignBit;
 
 const int kObjectAlignmentBits = kPointerSizeLog2;
 const intptr_t kObjectAlignment = 1 << kObjectAlignmentBits;
 const intptr_t kObjectAlignmentMask = kObjectAlignment - 1;
 
 // Desired alignment for pointers.
@@ skipping 503 matching lines @@
                   CMOV = 15,   // x86
                   RDTSC = 4,   // x86
                   CPUID = 10,  // x86
                   VFP3 = 1,    // ARM
                   ARMv7 = 2,   // ARM
                   SAHF = 0};   // x86
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_