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

["msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

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

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
While I haven't isolated it yet I suspect a bug in nettle and not one in gcc,
for at least three reasons:

First, the failures are insensitive to optimization levels.  Second, the same
two failures also appear on ppc64-redhat-linux with the system compiler (gcc
4.8.3).  Finally, the same failures also appear when I use clang 3.6.0 to
compile everything rather than gcc.

The test results on x86_64 running Fedora 21 are clean but that's most likely
because there nettle uses a different implementation of the encryption function
(defined in the generated camellia-crypt-internal.s based on the handcoded
assembly in x86_64/camellia-crypt-internal.asm).