[Bug target/65369] [5 Regression] nettle test failure on powerpc64le-linux-gnu when built with -O3

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65369

--- Comment #25 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Jakub's reduced- and the unreduced testcase also started to fail 
with r210843.