A patch for STV_PROTECTED

[Ulrich Drepper]

"H . J . Lu" <hjl@valinux.com> writes:

> This patch may not be 100% correct. But it passed all the visibility
> tests in today's binutils from CVS.

I'm still not sure whether this patch is correct.  Still I've checked
in a modified version of this patch.  I'll have to think more about it
and, especially, add lots of test cases to the test suite.

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