[SelectionDAG] Improve SimplifyDemandedBits to SimplifyDemandedVectorElts simplification
D52935 introduced the ability for SimplifyDemandedBits to call SimplifyDemandedVectorElts through BITCASTs if the demanded bit mask entirely covered the sub element.
This patch relaxes this to demanding an element if we need any bit from it.
Differential Revision: https://reviews.llvm.org/D54761
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348073 91177308-0d34-0410-b5e6-96231b3b80d8
11 files changed