[llvm] [RemoveDIs] Remove "try-debuginfo-iterators..." test flags (PR #130298)

[Jeremy Morse via llvm-commits]

jmorse wrote:

Cheers; and those four redundant comments are after deleting a hundred others X_X.

I believe the CI failure isn't related to this patch, it's in a clang-driver test and we don't touch clang at all. I'll try to double check locally on Windows.

https://github.com/llvm/llvm-project/pull/130298