[MLIR][Interfaces] Change MemorySlotInterface to use OpBuilder (#91341) This commit changes the `MemorySlotInterface` back to using `OpBuilder` instead of a rewriter. This was originally introduced in https://reviews.llvm.org/D150432 but it was shown that patterns are a bad idea for both Mem2Reg and SROA. Mem2Reg suffers from the usage of a rewriter due to being forced to create new basic blocks. This is an issue, as it leads to the invalidation of the dominance information, which can be expensive to recompute.
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