[llvm] [TableGen] Handle Windows line endings in x86-fold-tables.td test (PR #112997)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

It's possible that the original issue (CRLF checkouts on the Windows bots) is resolved now, thanks to the revert and restart of the buildbots (see https://discourse.llvm.org/t/windows-premerge-buildbot-broken-for-5-days/82571/8). So in that case we could revert this, and possibly add a `.gitattributes` file to mark the problematic file as always requiring checking out as LF.

It's a bit tricky to test it though - you'd need to run it through some other CI mechanism (as the regular buildbot doesn't apply `.gitattributes` on untouched files when updating), where you'd reapply dccebddb3b802c4c1fe287222e454b63f850f012 and check to see that the test still passes as expected, or at least that this file gets checked out like you'd expect.

https://github.com/llvm/llvm-project/pull/112997