Jakob Stoklund Olesen 997fa623fc Add TargetRegisterInfo::getCoveringLanes().
This lane mask provides information about which register lanes
completely cover super-registers. See the block comment before
getCoveringLanes().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182034 91177308-0d34-0410-b5e6-96231b3b80d8
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