[TableGen] Replace all lingering uses of getName with getEnumName

The former is a wrapper for the latter with two differences: Other is
mapped to "UNKNOWN" (rather than "MVT::Other"), and iPTR(Any) are mapped
to "TLI.getPointerTy()" rather than "MVT::iPTR(Any)".

The only uses are in FastISelMap::printFunctionDefinitions. Most of
these uses are just a form of name mangling to ensure uniqueness, so the
actual string isn't important (and, in the case of MVT::iPTR(Any), were
both to be used, they would clash). Two uses are for a case statement,
which requires the expression to be a constant (of the right type), but
neither UNKNOWN nor TLI.getPointerTy() are constants, so would not work
there. The remaining uses are where an expression is needed, so UNKNOWN
similarly doesn't work, though TLI.getPointerTy() could in this case.
However, neither iPTR nor iPTRAny are supposed to make it this far
through TableGen, and should instead have been replaced with concrete
types, so this case should not be hit. Moreover, for almost all of these
uses, the name is passed to getLegalCName, which will strip an MVT::
prefix but will leave TLI.getPointerTy() unchanged, which is not a valid
C identifier, nor component thereof.

Thus, delete this unnecessary, and mostly-broken, wrapper and just use
the underlying getEnumName. This has been verified to have no effect on
the generated files for any in-tree target, including experimental ones.

Reviewers: arsenm

Reviewed By: arsenm

Pull Request: https://github.com/llvm/llvm-project/pull/113731

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