[PATCH] Fix optnone on Windows

[Robinson, Paul]

[PATCH] Fix optnone on Windows

Normally an 'optnone' function goes through fast-isel, which does not
call DAGCombiner.  But we ran into a case (on Windows) where the
calling convention causes argument lowering to bail out of fast-isel,
and we end up in CodeGenAndEmitDAG() which does run DAGCombiner.
So, we need to make DAGCombiner check for 'optnone' after all.

Along the way we discovered we hadn't committed all the tests we had
written for 'optnone' so here are two more. 'fastmath-optnone.ll' is
the test that caught this, 'optnone-simple.ll' is one we missed from
our original implementation.
Thanks,
--paulr

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