[ModuleInlinerWrapperPass] Do some naive printing of wrapped pipeline with -print...

[ModuleInlinerWrapperPass] Do some naive printing of wrapped pipeline with -print-pipeline-passes

Bisecting and reducing opt pipelines that includes the
ModuleInlinerWrapperPass has turned out to be a bit problematic.
This is far from perfect (it still lacks information about inline
advisor params etc.), but it should give some kind of hint to what
the wrapped pipeline looks like when using -print-pipeline-passes.

Reviewed By: aeubanks, mtrofin

Differential Revision: https://reviews.llvm.org/D109878