[Bug testsuite/85106] Add scan-ltrans-tree-dump and scan-wpa-ipa-dump

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85106

--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #7)
> Thanks for working on this!  Note that there may be multiple ltrans units
> (in theory, not likely in the testsuite), so forcing -flto-partition=one
> when we
> see scan-ltrans-tree-dump would simplify things?

Yeah, I was wondering about that.

I was thinking of this kind of interface:
...
scan-ltrans-tree-dump regex suffix ltrans<n> [{ target/xfail selector }]
...
but I'll try the -flto-partition=one idea, indeed that seems simpler.