ia64: unat restoration fixes for setjmp() & getcontext()

[Ulrich Drepper]

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David Mosberger wrote:
> The ia64 versions of __sigsetjmp() and getcontext() failed to restore
> ar.unat before returning.  Patch below should fix that.

Applied.  Thanks,

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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
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