Fix -Wno-error= parsing in clang-format.

Authored by fodinabor on Dec 17 2020, 7:06 AM.


Fix -Wno-error= parsing in clang-format.

As noted in https://reviews.llvm.org/D86137#2460135 parsing of
the clang-format parameter -Wno-error=unknown fails.
This currently is done by having -Wno-error=unknown as an option.
In this patch this is changed to make -Wno-error= parse an enum into a bit set.
This way the parsing is fixed and also we can possibly add new options easily.

Reviewed By: MyDeveloperDay

Differential Revision: https://reviews.llvm.org/D93459