[llvm] [PowerPC][MC] Diagnose out of range branch fixups (PR #165859)

[Nikita Popov via llvm-commits]

nikic wrote:

> > I'm not sure if there is any way to test the absolute cases. It looks like something like `beqa 0, 0x10000` already gets rejected during parsing.
> 
> Could you use an expression, like beqa 0,lab-. ?

Thanks for the suggestion, this worked!

https://github.com/llvm/llvm-project/pull/165859