[X86][AVX] 256-bit vector stack unaligned load/stores identification

Under many circumstances the stack is not 32-byte aligned, resulting in the use of the vmovups/vmovupd/vmovdqu instructions when inserting ymm reloads/spills.

This minor patch adds these instructions to the isFrameLoadOpcode/isFrameStoreOpcode helpers so that they can be correctly identified and not be treated as folded reloads/spills.

This has also been noticed by http://llvm.org/bugs/show_bug.cgi?id=18846 where it was causing redundant spills - I've added a reduced test case at test/CodeGen/X86/pr18846.ll

Differential Revision: http://reviews.llvm.org/D6252



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222281 91177308-0d34-0410-b5e6-96231b3b80d8