[gcc(refs/users/aoliva/heads/testme)] testsuite: Accept pmf-vbit-in-delta extra warning

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:21d0765370c2de59412114759447950289af2b44

commit 21d0765370c2de59412114759447950289af2b44
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu Feb 23 10:30:24 2023 -0300

    testsuite: Accept pmf-vbit-in-delta extra warning
    
    cp_build_binary_op, that issues -Waddress warnings, issues an extra
    warning on arm targets, that g++.dg/warn/Waddress-5.C does not expect
    when comparing a pointer-to-member-function literal with null.
    
    The reason for the extra warning is that, on arm targets,
    TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_delta, which
    causes a different path to be taken, that extracts the
    pointer-to-function and the delta fields (minus the vbit) and compares
    each one with zero.  It's when comparing this pointer-to-function with
    zero, in a recursive cp_build_binary_op, that another warning is
    issued.
    
    I suppose there should be a way to skip the warning in this recursive
    call, without disabling other warnings that might be issued there, but
    this patch only arranges for the test to tolerate the extra warning.
    
    
    for  gcc/testsuite/ChangeLog
    
            * g++.dg/warn/Waddress-5.C: Tolerate extra -Waddress warning.

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