[patch] alpha: Fix SlowBCopy [was: xserver: Branch 'master']

[Michael Cree]

For your consideration:

Commit "Remove the remnants of Jensen
support" (c7680befe5aebd0f4277d11ff3984d8a7deb9d5b) not only removed the
Jensen support but also the dense support leaving behind only sparse
support for Linux Alpha.  This breaks the SlowBCopy routines on all BWX
enabled Alphas.

Re-add the test for sparse and dense systems and re-introduce the dense
code path.

Michael Cree.

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