Fix compile errors in Visual C++ 2008.

src/arm/assembler-arm.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 62 matching lines @@
   answer |= 1u << VFP3 | 1u << ARMv7;
 #endif  // defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(__VFP_FP__)
         // && !defined(__SOFTFP__)
 #endif  // def __arm__
 
   return answer;
 }
 
 
 void CpuFeatures::Probe() {
-  unsigned standard_features = (OS::CpuFeaturesImpliedByPlatform() |
-                                CpuFeaturesImpliedByCompiler());
+  unsigned standard_features = static_cast<unsigned>(
+      OS::CpuFeaturesImpliedByPlatform() | CpuFeaturesImpliedByCompiler());
   ASSERT(supported_ == 0 || supported_ == standard_features);
 #ifdef DEBUG
   initialized_ = true;
 #endif
 
   // Get the features implied by the OS and the compiler settings. This is the
   // minimal set of features which is also alowed for generated code in the
   // snapshot.
   supported_ |= standard_features;
 
@@ skipping 644 matching lines @@
         if (CpuFeatures::IsSupported(ARMv7)) {
           if (imm32 < 0x10000) {
             *instr ^= kMovwLeaveCCFlip;
             *instr |= EncodeMovwImmediate(imm32);
             *rotate_imm = *immed_8 = 0;  // Not used for movw.
             return true;
           }
         }
       }
     } else if ((*instr & kCmpCmnMask) == kCmpCmnPattern) {
-      if (fits_shifter(-imm32, rotate_imm, immed_8, NULL)) {
+      if (fits_shifter(-static_cast<int>(imm32), rotate_imm, immed_8, NULL)) {
         *instr ^= kCmpCmnFlip;
         return true;
       }
     } else {
       Instr alu_insn = (*instr & kALUMask);
       if (alu_insn == ADD ||
           alu_insn == SUB) {
-        if (fits_shifter(-imm32, rotate_imm, immed_8, NULL)) {
+        if (fits_shifter(-static_cast<int>(imm32), rotate_imm, immed_8, NULL)) {
           *instr ^= kAddSubFlip;
           return true;
         }
       } else if (alu_insn == AND ||
                  alu_insn == BIC) {
         if (fits_shifter(~imm32, rotate_imm, immed_8, NULL)) {
           *instr ^= kAndBicFlip;
           return true;
         }
       }
@@ skipping 1901 matching lines @@
 
   // Since a constant pool was just emitted, move the check offset forward by
   // the standard interval.
   next_buffer_check_ = pc_offset() + kCheckPoolInterval;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM