[DebugInfo][RemoveDIs] Use iterators to insert everywhere (#102003)

These are the final few places in LLVM where we use instruction pointers
to identify the position that we're inserting something. We're trying to
get away from that with a view to deprecating those methods, thus use
iterators in all these places. I believe they're all debug-info safe.

The sketchiest part is the ExtractValueInst copy constructor, where we
cast nullptr to a BasicBlock pointer, so that we take the non-default
insert-into-no-block path for instruction insertion, instead of the
default nullptr-instruction path for UnaryInstruction. Such a hack is
necessary until we get rid of the instruction constructor entirely.

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