Fix -Wsign-compare warnings in parser, scanner, regexp, runtime.

src/base/cpu.cc

 // Copyright 2013 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/base/cpu.h"
 
 #if V8_LIBC_MSVCRT
 #include <intrin.h>  // __cpuid()
 #endif
 #if V8_OS_LINUX
@@ skipping 397 matching lines @@
 
   // Interpret extended CPU feature information.
   if (num_ext_ids > 0x80000000) {
     __cpuid(cpu_info, 0x80000001);
     has_lzcnt_ = (cpu_info[2] & 0x00000020) != 0;
     // SAHF must be probed in long mode.
     has_sahf_ = (cpu_info[2] & 0x00000001) != 0;
   }
 
   // Check if CPU has non stoppable time stamp counter.
-  const int parameter_containing_non_stop_time_stamp_counter = 0x80000007;
+  const unsigned parameter_containing_non_stop_time_stamp_counter = 0x80000007;
   if (num_ext_ids >= parameter_containing_non_stop_time_stamp_counter) {
     __cpuid(cpu_info, parameter_containing_non_stop_time_stamp_counter);
     has_non_stop_time_stamp_counter_ = (cpu_info[3] & (1 << 8)) != 0;
   }
 
 #elif V8_HOST_ARCH_ARM
 
 #if V8_OS_LINUX
 
   CPUInfo cpu_info;
@@ skipping 273 matching lines @@
       part_ = PPC_POWER5;
       break;
   }
 #endif  // V8_OS_AIX
 #endif  // !USE_SIMULATOR
 #endif  // V8_HOST_ARCH_PPC
 }
 
 }  // namespace base
 }  // namespace v8