[llvm] fix(llvm/**.py): fix invalid escape sequences (PR #94035)

[Durgadoss R via llvm-commits]

durga4github wrote:

The wmma.py change in the NVPTX backend looks good to me.
But I would still prefer it as a separate PR with an [NVPTX] tag.

@Artem-B , Please let us know what do you think.


https://github.com/llvm/llvm-project/pull/94035