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

[David Green via llvm-commits]

davemgreen wrote:

Ah I see. Like this: https://gcc.godbolt.org/z/4Ph36xdEv? It sounds like that might work, so long as the operands have multiple uses it shouldn't just transform it back to a single add. It might need something like the current patch to handle single-use cases, with something different for multiple-uses.

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