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If the source instruction has !annotation metadata, all instructions created during combining should also have it. Tell the builder to add it. The !annotation system was discussed on llvm-dev as part of 'RFC: Combining Annotation Metadata and Remarks' (http://lists.llvm.org/pipermail/llvm-dev/2020-November/146393.html) This patch is based on an earlier patch by Francis Visoiu Mistrih. Reviewed By: thegameg, lebedev.ri Differential Revision: https://reviews.llvm.org/D91444
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