sysdeps/ia64/ieee754.h and sysdeps/ia64/fpu/math_ldbl.h for ia64

[Ulrich Drepper]

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

> It is to deal with 16byte long double. I am not if the big endia order
> for long double is correct.

This patch is OK, I've applied it.  Thanks,

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