[sir_richard] 45301: [PERF]: Optimize nested interrupt cases (where a pending interrupt exists at the end of a software or system interrupt) just like the old HAL did, by jumping into a second-level handler and completing the outer trap frame instead of the nested trap frame. This saves a lot of cycles in those cases, and they do happen quite often (pending DPC at the end of an interrupt, for example). [NTOS/HAL]: Rework respective code to handle this by using the VDM Alert field in the KPCR.

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