[PATCH] PR21604: Correctly remove OptimizeForSize from OptimizeNone functions

[Robinson, Paul]

While it might have looked like OptimizeNone removed the OptimizeForSize
attribute from a function, it weren't necessarily so.  This patch fixes
the attribute handling so 'optnone' correctly supersedes all the other
things it's supposed to supersede.

Updated a test to do a -Os run so we verify that part works right.
Added a test to exercise different combinations of attributes on the 
declaration versus on the definition, which is another way that these
things can end up having to be merged/untangled.
--paulr

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