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[clang][cli] Let denormalizer decide how to render the option based on the option class
Before this patch, you needed to use `AutoNormalizeEnumJoined` whenever you wanted to **de**normalize joined enum.
Besides the naming confusion, this means the fact the option is joined is specified in two places: in the normalization multiclass and in the `Joined<["-"], ...>` multiclass.
This patch makes this work automatically, taking into account the `OptionClass` of options.
Also, the enum denormalizer now just looks up the spelling of the present enum case in a table and forwards it to the string denormalizer.
I also added more tests that exercise this.
Reviewed By: dexonsmith
Original patch by Daniel Grumberg.
Differential Revision: https://reviews.llvm.org/D84189