A new class is added, IRMultiObjectWithUseList, that allows for representing an IR use list that holds multiple sub values(used in this case for OpResults). This class provides all of the same functionality as the base IRObjectWithUseList, but for specific sub-values. This saves a word per operation result and is a necessary step in optimizing the layout of operation results. For now the use list is placed on the operation itself, so zero-result operations grow by a word. When the work for optimizing layout is finished, this can be moved back to being a trailing object based on memory/runtime benchmarking.
Unit tests: pass. 61132 tests passed, 0 failed and 728 were skipped.
clang-tidy: fail. Please fix clang-tidy findings.
clang-format: fail. Please format your changes with clang-format by running git-clang-format HEAD^ or applying this patch.