[llvm] [utils][TableGen] Handle versions on clause/directive spellings (PR #143021)

[Krzysztof Parzyszek via llvm-commits]

kparzysz wrote:

PR stack:
1. https://github.com/llvm/llvm-project/pull/141761
2. https://github.com/llvm/llvm-project/pull/141762
3. https://github.com/llvm/llvm-project/pull/141763
4. https://github.com/llvm/llvm-project/pull/141765
5. ~~https://github.com/llvm/llvm-project/pull/141766~~
https://github.com/llvm/llvm-project/pull/143021 (this PR)
6. https://github.com/llvm/llvm-project/pull/141772

https://github.com/llvm/llvm-project/pull/143021