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This revision moves the various range utilities present in MLIR to LLVM to enable greater reuse. This revision moves the following utilities: * indexed_accessor_* This is set of utility iterator/range base classes that allow for building a range class where the iterators are represented by an object+index pair. * make_second_range Given a range of pairs, returns a range iterating over the `second` elements. * hasSingleElement Returns if the given range has 1 element. size() == 1 checks end up being very common, but size() is not always O(1) (e.g., ilist). This method provides O(1) checks for those cases. Differential Revision: https://reviews.llvm.org/D78064
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