[Bug testsuite/27396] New: setup_xfail leaks into next test-case

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

https://sourceware.org/bugzilla/show_bug.cgi?id=27396

            Bug ID: 27396
           Summary: setup_xfail leaks into next test-case
           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: ---

When running the testsuite with target board, unix/gdb:debug_flags=-gdwarf-5 I
first run into:
...
(gdb) PASS: gdb.cp/temargs.exp: test value of I in templ_m
info addr I^M
ERROR: GDB process no longer exists
GDB process exited with wait status 16930 exp19 0 0 CHILDKILLED SIGABRT SIGABRT
UNRESOLVED: gdb.cp/temargs.exp: test address of I in templ_m
DUPLICATE: gdb.cp/temargs.exp: test address of I in templ_m
ERROR: Couldn't send print P == &a_global to GDB.
ERROR: can not find channel named "exp19"
...
and then in the next test-case:
...
(gdb) set multiple-symbols ask^M
(gdb) XPASS: gdb.cp/templates.exp: set multiple-symbols ask (PRMS gcc/49546)
...

It seems the setup_xfail executed in temargs.exp:
...
if $have_older_template_gcc { setup_xfail "*-*-*"
} else { setup_xfail gcc/49546 "*-*-*" }
gdb_test "print F" { = \(void \(\*\)\(int\)\) 0x[0-9a-f]+ <S3::m\(int\)>} \
         "test value of F in k3_m"
...
is effective here in templates.exp:
...
    gdb_test_no_output "set multiple-symbols ask"
...

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