[Support, Windows] Retry rename() when MoveFileExW returns ERROR_SHARING_VIOLATION

[iid_iunknown]

Summary

Currently rename() retries MoveFileExW if it returns ERROR_ACCESS_DENIED.
MoveFileExW may also fail with ERROR_SHARING_VIOLATION when the file is opened by some other app.

This patch makes rename() aware of ERROR_SHARING_VIOLATION when moving the file, so that it does
not stop its attempts to move the file if this error is encountered.

[iid_iunknown]

A gentle reminder about this patch.

[rnk]

You will need to rebase this past rL315222.

lib/Support/Windows/Path.inc

for (int i = 0; i < 2000; i++) {
     }
 
     if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
                       MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
       return std::error_code();
 
     DWORD MoveError = ::GetLastError();
     ec = mapWindowsError(MoveError);
-    if (MoveError != ERROR_ACCESS_DENIED) break;
+    if (MoveError != ERROR_ACCESS_DENIED &&
+        MoveError != ERROR_SHARING_VIOLATION)
+      break;
   }
 
   return ec;
 }
 
 std::error_code resize_file(int FD, uint64_t Size) {
 #ifdef HAVE__CHSIZE_S
   errno_t error = ::_chsize_s(FD, Size);