[Bug testsuite/31566] New: [gdb/testsuite] is_aarch32_target return false on aarch32

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

https://sourceware.org/bugzilla/show_bug.cgi?id=31566

            Bug ID: 31566
           Summary: [gdb/testsuite] is_aarch32_target return false on
                    aarch32
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

While running tests on aarch64-linux, I noticed:
...
Executing on host: gcc  -fno-stack-protector  -fdiagnostics-color=never -w -c
-g  -o /data/vries/gdb/build/gdb/testsuite/temp/1485517/aarch32.o
/data/vries/gdb/build/gdb/testsuite/temp/1485517/aarch32.c    (timeout = 300)
builtin_spawn -ignore SIGHUP gcc -fno-stack-protector -fdiagnostics-color=never
-w -c -g -o /data/vries/gdb/build/gdb/testsuite/temp/1485517/aarch32.o
/data/vries/gdb/build/gdb/testsuite/temp/1485517/aarch32.c^M
/data/vries/gdb/build/gdb/testsuite/temp/1485517/aarch32.c:1:9: error: unknown
type name 'mov'^M
    1 |         mov r0, r0^M
      |         ^~~^M
...

This is is_aarch32_target:
...
gdb_caching_proc is_aarch32_target {} {
    if { [istarget "arm*-*-*"] } {
        return 1
    }

    if { ![istarget "aarch64*-*-*"] } {
        return 0
    }

    set list {}
    foreach reg \
        {r0 r1 r2 r3} {
            lappend list "\tmov $reg, $reg"
        }

    return [gdb_can_simple_compile aarch32 [join $list \n]]
}
...

On an aarch32 target, this will always return false, because it tries to
compile raw assembly instructions in a .c file using a compiler.

AFAICT, this is a regression since commit c221b2f7708 ("Testsuite: Add
gdb_can_simple_compile").

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