Fix a bunch of implicit casts detected by the Win64 compiler

src/debug.cc

 // Copyright 2012 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 1858 matching lines @@
     }
 
     // Iterate over the RelocInfo in the original code to compute the sum of the
     // constant pools sizes. (See Assembler::CheckConstPool())
     // Note that this is only useful for architectures using constant pools.
     int constpool_mask = RelocInfo::ModeMask(RelocInfo::CONST_POOL);
     int frame_const_pool_size = 0;
     for (RelocIterator it(*frame_code, constpool_mask); !it.done(); it.next()) {
       RelocInfo* info = it.rinfo();
       if (info->pc() >= frame->pc()) break;
-      frame_const_pool_size += info->data();
+      frame_const_pool_size += static_cast<int>(info->data());
     }
     intptr_t frame_offset =
       frame->pc() - frame_code->instruction_start() - frame_const_pool_size;
 
     // Iterate over the RelocInfo for new code to find the number of bytes
     // generated for debug slots and constant pools.
     int debug_break_slot_bytes = 0;
     int new_code_const_pool_size = 0;
     int mask = RelocInfo::ModeMask(RelocInfo::DEBUG_BREAK_SLOT) |
                RelocInfo::ModeMask(RelocInfo::CONST_POOL);
     for (RelocIterator it(*new_code, mask); !it.done(); it.next()) {
       // Check if the pc in the new code with debug break
       // slots is before this slot.
       RelocInfo* info = it.rinfo();
       intptr_t new_offset = info->pc() - new_code->instruction_start() -
                             new_code_const_pool_size - debug_break_slot_bytes;
       if (new_offset >= frame_offset) {
         break;
       }
 
       if (RelocInfo::IsDebugBreakSlot(info->rmode())) {
         debug_break_slot_bytes += Assembler::kDebugBreakSlotLength;
       } else {
         ASSERT(RelocInfo::IsConstPool(info->rmode()));
         // The size of the constant pool is encoded in the data.
-        new_code_const_pool_size += info->data();
+        new_code_const_pool_size += static_cast<int>(info->data());
       }
     }
 
     // Compute the equivalent pc in the new code.
     byte* new_pc = new_code->instruction_start() + frame_offset +
                    debug_break_slot_bytes + new_code_const_pool_size;
 
     if (FLAG_trace_deopt) {
       PrintF("Replacing code %08" V8PRIxPTR " - %08" V8PRIxPTR " (%d) "
              "with %08" V8PRIxPTR " - %08" V8PRIxPTR " (%d) "
@@ skipping 1722 matching lines @@
     {
       Locker locker;
       Isolate::Current()->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal