[Bug testsuite/102857] [12 regression] r12-4526 caused regressions on ssa-dom-thread-7.c

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102857

--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aldy Hernandez <aldyh@gcc.gnu.org>:

https://gcc.gnu.org/g:4e417eea8f3f14131f7370f9bd5dd568611d11df

commit r12-4701-g4e417eea8f3f14131f7370f9bd5dd568611d11df
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Sat Oct 23 08:59:24 2021 +0200

    [PR testsuite/102857] Tweak ssa-dom-thread-7.c for aarch64.

    First, ssa-dom-thread-7 was looking at a dump file that was not
    being generated.  This probably happened in the detangling of the VRP
    threader from VRP, and I didn't notice because the test came back as
    with UNRESOLVED instead of FAIL.

    Second, aarch64 gets far more threads than other architectures (20
    versus 12).  The difference is sufficiently different to make the
    regex awkward.

    We already have special casing for aarch64 in other parts of this
    test, so perhaps it's simplest to have an arch specific test
    for the thread3 count.

    I don't know perhaps there's a better way.  I wake up with chills in
    the middle of the night thinking about this test ;-).

    Tested on x86-64 Linux and aarch64 Linux.

    gcc/testsuite/ChangeLog:

            PR testsuite/102857
            * gcc.dg/tree-ssa/ssa-dom-thread-7.c: Add -fdump-tree-vrp2-stats.
            Tweak for aarch64.