[visium] skip block move insn test on gr5

[Olivier Hainque]

Block move insns are specific to gr6. They aren't
available at all on gr5.

Committing to mainline with offline agreement from Eric.

Olivier

2015-12-14  Olivier Hainque  <hain...@adacore.com>

testsuite/
        *  gcc.target/visium/block_move.c: Skip for gr5.

skip-bmd-gr5.diff
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