Update src/atomics.jl

Co-authored-by: Valentin Churavy <vchuravy@users.noreply.github.com>

Author: leios

src/atomics.jl

@@ -51,7 +51,7 @@ end
 
 # TODO: Not sure what this one is...
 function atomic_cas!(ptr::Ptr{T}, old::T, new::T) where T
-    Core.Intrinsics.atomic_pointerswap(ptr::Ptr{T}, x::T, :monotonic)
+    Core.Intrinsics.atomic_pointerreplace(ptr::Ptr{T}, old, new, :release_acquire, :monotonic)
 end
 
 # TODO: Not sure what this one is...