[GISel] Handle Flags in G_PTR_ADD Combines (#152495) So far, GlobalISel's G_PTR_ADD combines have ignored MIFlags like nuw, nusw, and inbounds. That was in many cases unnecessarily conservative and in others unsound, since reassociations re-used the existing G_PTR_ADD instructions without invalidating their flags. This patch aims to improve that. I've checked the transforms in this PR with Alive2 on corresponding middle-end IR constructs. A longer-term goal would be to encapsulate the logic that determines which GEP/ISD::PTRADD/G_PTR_ADD flags can be preserved in which case, since this occurs in similar forms in the middle end, the SelectionDAG combines, and the GlobalISel combines here. For SWDEV-516125.
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