i1675 IT block: Use -mno-warn-deprecated on ARM with tests. (#2908)
i1675 IT block: Use -mno-warn-deprecated on ARM with tests. (#2908)

This silences assembly deprecation warnings from some test cases. We might miss some valid assembly warnings, but the flag is only set when building tests. For builds without tests, we still get the warnings.

Fixes #1675
AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio