[llvm] [LOH] Emit hints for LDP/STP instructions (PR #141297)

[Ellis Hoag via llvm-commits]

ellishg wrote:

It turns out that this isn't as impactful as I thought, so I'll close this.

I had also implemented the str optimizations in LLD in https://github.com/ellishg/llvm-project/commit/7a2d23be7ae38c9127559fc0b3a1bfbb6d6d34ea and parsed float ldr/str instructions in https://github.com/ellishg/llvm-project/commit/bf8975feb343cb171882a740b5830e2c42c7b3be. I'm linking them here so I don't lose them.

https://github.com/llvm/llvm-project/pull/141297