[X86] Suppress load folding into and/or/xor if it will prevent matching btr/bts/btc.

This is a follow up to r335753. At the time I forgot about isProfitableToFold which makes this pretty easy.

Differential Revision: https://reviews.llvm.org/D48706

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335895 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed