[libclc] [libclc] Fix typo in __clc_atomic_dec/inc functions (PR #168327)

[Wenju He via cfe-commits]

wenju-he wrote:

> > > I think __clc_atomic_inc/dec should be deleted, or renamed. inc is a different op (i.e., atomicrmw uinc_wrap)
> > 
> > 
> > can we add new __scoped_atomic_uinc_wrap/udec_wrap clang builtin and use it for __clc_atomic_inc/dec implementation? our downstream implementation of __clc_atomic_inc does use uinc_wrap in atomicrmw.
> 
> Yes, should do that

changed to use __scoped_atomic_uinc_wrap for __clc_atomic_inc and __scoped_atomic_udec_wrap for __clc_atomic_dec

https://github.com/llvm/llvm-project/pull/168327