[Bug math/18111] hppa: fesetexceptflag not correctly setting new flag.

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18111

--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
The existing hppa code does this:

s.sw[0] |= (*flagp & excepts & FE_ALL_EXCEPT) << 27;

When it should do something like this:

excepts &= FE_ALL_EXCEPT;
s.sw[0] = s.sw[0] & ~(excepts << 27);
s.sw[0] |= (*flagp & excepts) << 27;

Which actually clears the flags if excepts specifies more flag bits than *flagp
sets.

While fixing this I decided to rewrite it using fpu_control.h to test the new
code, and in doing so fixed a bug in fpu_control.h with _FPU_SETCW not
initializing the other word is loads/stores.

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