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This is an almost-final step in eliminating debug-intrinsics -- read more about that here: https://llvm.org/docs/RemoveDIsDebugInfo.html . To correctly update variable location information in the background when inserting instructions, we need some information carried at runtime in BasicBlock::iterator, hence deprecating pointer-insertion. An immediate fix for any deprecation warnings is to call "getIterator" on the insertion position pointer. If you intend on inserting at the start of a block, use BB->begin() or similar methods to fetch the appropriate iterator.