Reintroduce full AsmPrinterHandler API (#122297) #39
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This restores the functionality of AsmPrinterHandlers to what it was prior to llvm#96785. The attempted hack there of adding a duplicate DebugHandlerBase handling added a lot of hidden state and assumptions, which just segfaulted when we tried to continuing using this API. Instead, this just goes back to the old design, but adds a separate array for the basic EH handles. The duplicate array is identical to the other array of handler, but which doesn't get their begin/endInstruction callbacks called. This still saves the negligible but measurable amount of virtual function calls as was the goal of llvm#96785, while restoring the API to the pre-LLVM-19 status quo. (cherry picked from commit f6b0555)
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Backport of llvm#122297 by @vtjnash. There were some conflicts, I hope I didn't mess it up too much.