[llvm-dev] Run llc with -debug flag

[Meet Udeshi via llvm-dev]

I want to check debug output of "PrologEpilogInserter" machine pass, and I
have seen in the code that there are various `DEBUG` macros added.

However, there is no `-debug` option present for `llc` like it is for
`opt`. Closest option I saw after seeing output of `llc --help-list` is
`-verify-debug-info` but that does not give any output.

Regards,
Meet.
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