[PATCH] Disable passes on optnone functions

[Robinson, Paul]

This patch disables a number of Machine Function Passes for functions
with the 'optnone' attribute.

To come up with the list of passes, I looked at CodeGen/Passes.cpp,
and disabled whatever would be excluded under CodeGenOpt::None.
Except, I did not disable anything listed in addOptimizedRegAlloc(),
as I can't see how to substitute one RA pass sequence for another on
a per-function basis.  Maybe there's a way to deal with that safely,
but for now it seemed prudent (and not horribly harmful to the goals
of 'optnone') to leave well enough alone.
If anybody has an idea, we're open to it.
Thanks,
--paulr

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