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088d272e83
...behind an experimental CMAKE option that's off by default. This patch adds a new ilist-iterator-like class that can carry two extra bits as well as the usual node pointer. This is part of the project to remove debug-intrinsics from LLVM: see the rationale here [0], they're needed to signal whether a "position" in a BasicBlock includes any debug-info before or after the iterator. This entirely duplicates ilist_iterator, attempting re-use showed it to be a false economy. It's enable-able through the existing ilist_node options interface, hence a few sites where the instruction-list type needs to be updated. The actual main feature, the extra bits in the class, aren't part of the class unless the cmake flag is given: this is because there's a compile-time cost associated with it, and I'd like to get everything in-tree but off-by-default so that we can do proper comparisons. Nothing actually makes use of this yet, but will do soon, see the Phab patch stack. [0] https://discourse.llvm.org/t/rfc-instruction-api-changes-needed-to-eliminate-debug-intrinsics-from-ir/68939 Differential Revision: https://reviews.llvm.org/D153777