[PATCH] powerpc: fix tst-ucontext-ppc64-vscr test for POWER 5/6

[Rogerio Alves]

Hi,

I've sent a patch 
https://sourceware.org/ml/libc-alpha/2018-11/msg00357.html that fix VSCR 
reading from ucontext_t for powerpc BZ#24088. The problem is that the 
test was fail to compile on POWER 5 and 6. The test was using __vector 
__int128_t and generating an error impossible register constraint in 
'asm' if compiled without -mvsx flag.

In fact the test doesn't need to use a __int128_t. A unsigned int should 
be fine. So I am sent another patch to fix this since the other patch 
was already committed. I will appreciate any comments or reviews on this.

Regards,
Rogerio
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