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b62ba5eca0
ARM64 was not producing pure BFI instructions for bitfield insertion operations, unlike AArch64. The approach had to be a little different (in ISelDAGToDAG rather than ISelLowering), and the outcomes aren't identical but hopefully this gives it similar power. This should address PR19424. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207102 91177308-0d34-0410-b5e6-96231b3b80d8
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