Use C++ style type casts.

src/conversions-inl.h

 // Copyright 2011 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 194 matching lines @@
         number++;  // Rounding up.
       } else if (dropped_bits == middle_value) {
         // Rounding to even to consistency with decimals: half-way case rounds
         // up if significant part is odd and down otherwise.
         if ((number & 1) != 0 || !zero_tail) {
           number++;  // Rounding up.
         }
       }
 
       // Rounding up may cause overflow.
-      if ((number & ((int64_t)1 << 53)) != 0) {
+      if ((number & (static_cast<int64_t>(1) << 53)) != 0) {
         exponent++;
         number >>= 1;
       }
       break;
     }
     ++current;
   } while (current != end);
 
   ASSERT(number < ((int64_t)1 << 53));
   ASSERT(static_cast<int64_t>(static_cast<double>(number)) == number);
@@ skipping 443 matching lines @@
   ASSERT(buffer_pos < kBufferSize);
   buffer[buffer_pos] = '\0';
 
   double converted = Strtod(Vector<const char>(buffer, buffer_pos), exponent);
   return (sign == NEGATIVE) ? -converted : converted;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONVERSIONS_INL_H_