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bfa7594241
CodeGenPrepare has a transform that sinks {lshr, trunc} pairs to make it
easier for the backend to emit fancy extract-bits instructions (e.g UBFX).
Teach it to preserve debug locations and salvage debug values.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342319 91177308-0d34-0410-b5e6-96231b3b80d8