[llvm] [llvm][Tablegen][llvm-tblgen] Added keyword #undef to llvm-tblgen (PR #69135)

[Jon Roelofs via llvm-commits]

jroelofs wrote:

In addition, it would also be good to have a test that re-`#define`s after `#undef`-ing.

https://github.com/llvm/llvm-project/pull/69135