[llvm] [Passes] Enhance `--print-pipeline-passes` (PR #202892)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> Pass pipeline string is white space sensitive

This is a bit unfortunate but I would imagine pretty easy to fix. Whitespace doesn't have any semantic meaning in the parser so it should be possible to just make the parser skip whitespace.

https://github.com/llvm/llvm-project/pull/202892