[committed] hppa: Implement swapcontext in assembler (bug 28960)

[Andreas Schwab]

On Mär 15 2022, John David Anglin wrote:

> +PSEUDO_END(__swapcontext)

PSEUDO_END is supposed to pair with PSEUDO, to be used for syscalls
only.  General assembler routines should be terminated with END.

-- 
Andreas Schwab, schwab@linux-m68k.org
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