[Bug testsuite/30928] [gdb/testsuite] Compilation failure for gdb.arch/i386-signal.exp

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30928

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Bisects to:
...
$ git bisect bad
5cc007751cdb8ea713c98294e37cd447c12c9bab is the first bad commit
commit 5cc007751cdb8ea713c98294e37cd447c12c9bab
Author: Jan Beulich <jbeulich@suse.com>
Date:   Fri May 19 09:18:09 2023 +0200

    x86: further adjust extend-to-32bit-address conditions

    While a442cac5084e ("ix86: wrap constants") helped address a number of
    inconsistencies between BFD64 and !BFD64 builds, it has also resulted in
    certain bogus uses of constants to no longer be warned about. Leverage
    the md_optimize_expr() hook to adjust when to actually truncate
    expressions to 32 bits - any involvement of binary expressions (which
    would be evaluated in 32 bits only when !BFD64) signals the need for
    doing so. Plain constants (or ones merely subject to unary operators)
    should remain un-truncated - they would be handled as bignums when
    !BFD64, and hence are okay to permit.

    To compensate
    - slightly extend optimize_imm() (to be honest I never understood why
      the code being added - or something similar - wasn't there in the
      first place),
    - adjust expectations of the disp-imm-32 testcase (there are now
      warnings, as there should be for any code which won't build [warning-
      free] when !BFD64, and Disp8/Imm8 are no longer used in the warned
      about cases).
...

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