[llvm] MC: Refine ALIGN relocation conditions (PR #150816)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> LGTM, thanks MaskRay, I was just trying to using same approach as I fixing at binutils side to fix LLVM, but I apparently lack of global view on the MC layer, so I didn't aware there is more place need to adjust.

Thanks for the review! I'll wait a bit before landing this.

> And I have to say those relaxation corner case is really terrible even I am a RISC-V guy...
> 
> [1] #150159

Yeah. I assumed linker relaxation was a resolved issue, but new challenges keep emerging each year...

https://github.com/llvm/llvm-project/pull/150816