[llvm] [AArch64] merge index address with large offset into base address (PR #72187)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

This seems like it would be simpler to do at the point where we're computing the addressing mode in the first place (in ISelDAGToDAG).

https://github.com/llvm/llvm-project/pull/72187