[llvm] [RemoveDIs] Add flag to preserve the debug info format of input IR (PR #87379)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

Apologies for the delay, as mentioned above I was away for the last week. The error in this patch turned out to be fairly obvious, and should be fixed by https://github.com/llvm/llvm-project/pull/88718, which I've just merged.

https://github.com/llvm/llvm-project/pull/87379