[NFC][DebugInfo] Use iterator moveBefore at many call-sites (#123583) As part of the "RemoveDIs" project, BasicBlock::iterator now carries a debug-info bit that's needed when getFirstNonPHI and similar feed into instruction insertion positions. Call-sites where that's necessary were updated a year ago; but to ensure some type safety however, we'd like to have all calls to moveBefore use iterators. This patch adds a (guaranteed dereferenceable) iterator-taking moveBefore, and changes a bunch of call-sites where it's obviously safe to change to use it by just calling getIterator() on an instruction pointer. A follow-up patch will contain less-obviously-safe changes. We'll eventually deprecate and remove the instruction-pointer insertBefore, but not before adding concise documentation of what considerations are needed (very few).
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