[clang] Use -Wshorten-64-to-32 to enable warnings about 64bit to 32bit truncations.

src/utils.cc

 // Copyright 2011 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 <stdarg.h>
 #include <sys/stat.h>
 
 #include "src/v8.h"
 
 #include "src/base/functional.h"
@@ skipping 185 matching lines @@
                         bool verbose,
                         const char* filename) {
   if (file == NULL || fseek(file, 0, SEEK_END) != 0) {
     if (verbose) {
       base::OS::PrintError("Cannot read from file %s.\n", filename);
     }
     return NULL;
   }
 
   // Get the size of the file and rewind it.
-  *size = ftell(file);
+  *size = static_cast<int>(ftell(file));
   rewind(file);
 
   char* result = NewArray<char>(*size + extra_space);
   for (int i = 0; i < *size && feof(file) == 0;) {
     int read = static_cast<int>(fread(&result[i], 1, *size - i, file));
     if (read != (*size - i) && ferror(file) != 0) {
       fclose(file);
       DeleteArray(result);
       return NULL;
     }
@@ skipping 203 matching lines @@
   }
   if (u.bits.exp == 0) {
     // Detect +0, and -0 for IEEE double precision floating point.
     if ((u.bits.man_low | u.bits.man_high) == 0) return false;
   }
   return true;
 }
 
 
 } }  // namespace v8::internal