[InstCombine] Support nested GEPs in OptimizePointerDifference (#142958) Currently OptimizePointerDifference() only handles single GEPs with a common base, not GEP chains. This patch generalizes the support to nested GEPs with a common base. Finding the common base is a bit annoying because we want to stop as soon as possible and not recurse into common GEP prefixes. This helps avoids regressions from https://github.com/llvm/llvm-project/pull/137297.
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