[PATCH] [dlang/phobos] S/390: Fix PR91628

[Robin Dapp]

> OK from me, what about earlier comments of using __asm__ in a C
> source file?
> 
> I wouldn't really object to converting all .S sources (infact I can
> do this myself) if it meant slightly better portability.

Adding to yesterday's message: feel free to apply the current version if
it's OK.  The inline __asm__ with the dummy function call seemed a bit
too hacky for most people.

Regards
 Robin