[Bug rtl-optimization/59754] [ree.c] Incorrect merge while working with vector registers

[kirill.yukhin at intel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59754

--- Comment #1 from Yukhin Kirill <kirill.yukhin at intel dot com> ---
> made bunch of AVX-512F tests failing (at runtime):
FAIL: gcc.target/i386/avx512f-vpmovsxdq-2.c execution test
FAIL: gcc.target/i386/avx512f-vpmovsxwd-2.c execution test
FAIL: gcc.target/i386/avx512f-vpmovzxdq-2.c execution test
FAIL: gcc.target/i386/avx512f-vpmovzxwd-2.c execution test