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Summary: Constrain which metadata nodes are allowed to be, or contain, DILocations. This ensures that logic for updating DILocations in a Module is complete. Currently, !llvm.loop metadata is the only odd duck which contains nested DILocations. This has caused problems in the past: some passes forgot to visit the nested locations, leading to subtly broken debug info and late verification failures. If there's a compelling reason for some future metadata to nest DILocations, we'll need to introduce a generic API for updating the locations attached to an Instruction before relaxing this check. Reviewers: aprantl, dsanders Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D79245
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