[X86] Add vector shift by immediate to SimplifyDemandedBitsForTargetNode.
Summary: This also enables some constant folding from KnownBits propagation. This helps on some cases vXi64 case in 32-bit mode where constant vectors appear as vXi32 and a bitcast. This can prevent getNode from constant folding sra/shl/srl.
Reviewers: RKSimon, spatel
Reviewed By: spatel
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D54069
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346102 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed