[sanitizers] Explicitly use GetModuleFileNameW with wchar_t

[mstorsjo]

Summary

Alternatively we could define the string as TCHAR.

This fixes building with clang-cl in setups where UNICODE isn't defined (which seems to be the case when building compiler-rt standalone outside of the llvm tree).

[rnk]

lgtm

compiler-rt/trunk/lib/sanitizer_common/sanitizer_win.cc

 
 void LogFullErrorReport(const char *buffer) {
   if (common_flags()->log_to_syslog) {
     InternalMmapVector<wchar_t> filename;
     DWORD filename_length = 0;
     do {
       filename.resize(filename.size() + 0x100);
       filename_length =
-          GetModuleFileName(NULL, filename.begin(), filename.size());
+          GetModuleFileNameW(NULL, filename.begin(), filename.size());
     } while (filename_length >= filename.size());
     TraceLoggingWrite(g_asan_provider, "AsanReportEvent",
                       TraceLoggingValue(filename.begin(), "ExecutableName"),
                       TraceLoggingValue(buffer, "AsanReportContents"));
   }
 }
 
 }  // namespace __sanitizer
 
 #endif  // _WIN32