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

[thopre01 at gcc dot gnu.org]

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

            Bug ID: 70553
           Summary: pr70496.c should exclude Thumb only targets
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thopre01 at gcc dot gnu.org
                CC: ramana.radhakrishnan at arm dot com
  Target Milestone: ---
            Target: arm-none-eabi

gcc.target/arm/pr70496.c fails with the following error when targeting
Cortex-M3:

"selected processor does not support ARM opcodes"

Since the test contains a .arm directive, it should skip Thumb only devices.