[lld] [lld][RISCV] Add break to nested switch in `mergeAtomic` (PR #99762)

[Brandon Wu via llvm-commits]

4vtomat wrote:

> > > Right, but I don’t recall seeing that with a pretty recent clang, and I want to know if you’re using gcc or another compiler so I know if I should see if we should fix that in clang.
> > 
> > 
> > Actually it's during compiling the `lld` itself lol~
> 
> Yes, but are you compiling with clang as the compiler or something else? Because if it’s clang then I don’t need to file a bug and try to run down why we’re not handling that. If you’re using something else, then I do.

Oh, I got your point, I was using gcc.

https://github.com/llvm/llvm-project/pull/99762