[llvm] [NFC][TableGen] Print topmost def location for Intrinsics/Insts (PR #160796)

[Jay Foad via llvm-commits]

jayfoad wrote:

> Are you suggesting we print the whole stack? It's just more comments, but maybe possible. We can make it more compact as well by commoning file name when possible.

Oh, I assumed this was for diagnostics, not for comments.

If it's just for comments then I don't mind too much. I'm fine with this version if it happens to make the output more useful for X86.

https://github.com/llvm/llvm-project/pull/160796