[Bug target/59539] Missed optimisation: VEX-prefixed operations don't need aligned data

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59539

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Because otherwise it can generate an aligned load, and I thought when user
explicitly writes he wants an unaligned load we should honor it, perhaps for
some reason the alignment info can't be trusted etc.
ix86_expand_vector_move_misalign also checks misaligned_operand and only emits
the non-UNSPEC insn for TARGET_AVX if it will result in misaligned load.