[llvm] [SelectionDAG] Introduce ISD::PTRADD (PR #140017)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

This patch adds more calls to `getMemBasePlusOffset()`, but the method wasn't updated to generate `ISD::PTRADD`, is this intended?


https://github.com/llvm/llvm-project/pull/140017