[Bug testsuite/70553] pr70496.c should exclude Thumb only targets

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70553

--- Comment #3 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Ramana Radhakrishnan from comment #2)
> Fixed then ?

Yes, sorry.