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2b1122eaec
These are the final few places in LLVM that use instruction pointers to insert instructions -- use iterators instead, which is needed for debug-info correctness in the future. Most of this is a gentle scattering of getIterator calls or not deref-then-addrofing iterators. libfuzzer does require a storage change to keep built instruction positions in a container though. The unit-test changes are very straightforwards. This leaves us in a position where libfuzzer can't fuzz on either of debug-info records, however I don't believe that fuzzing of debug-info is in scope for the library.