[testsuite] arm thumb tests: remove -march= and dg-prune-output from 9 tests

[Janis Johnson]

This patch removes -march= from nine tests that also check for relevant
effective targets.  If -march is removed there is no need to ignore
compiler warnings about conflicting options with dg-prune-output, so the
patch removes that from the tests.

OK for trunk, and for 4.6 in a few days?
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