a85e84b854
This PR preserves the InBounds flag (#162477) where possible in PTRADD-related DAGCombines. We can't preserve them in all the cases that we could in the analogous GISel change (#152495) because SDAG usually represents pointers as integers, which means that pointer provenance is not preserved between PTRADD operations (see the discussion at PR #162477 for more details). This PR marks the places in the DAGCombiner where this is relevant explicitly. For SWDEV-516125.
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