[Bug target/84422] ICE on various builtin test functions when compiled with -mcpu=power7

[carll at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84422

--- Comment #4 from Carl Love <carll at gcc dot gnu.org> ---
gcc/testsuite/gcc.target/powerpc/fold-vec-neg-longlong.p8.c
    during RTL pass: vregs

gcc/testsuite/gcc.target/powerpc/fold-vec-neg-longlong.p9.c
    during RTL pass: vregs

Both tests fixed with mainline commit 258006 on 2/26/2018