hppa: Fix swapcontext

This change fixes the failure of stdlib/tst-setcontext2 and
stdlib/tst-setcontext7 on hppa.  The implementation of swapcontext
in C is broken.  C saves the return pointer (rp) and any non
call-clobbered registers (in this case r3, r4 and r5) on the
stack.  However, the setcontext call in swapcontext pops the
stack and subsequent calls clobber the saved registers.  When
the context in oucp is restored, both tests fault.

Here we rewrite swapcontext in assembly code to avoid using
the stack for register values that need to be used after
restoration.  The getcontext and setcontext routines are
revised to save and restore register ret1 for normal returns.
We copy the oucp pointer to ret1.  This allows access to
the old context after calling getcontext and setcontext.

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