Summary:
The `__scoped_atomic` builtins are supposed to match the standard
GNU-flavored `__atomic` builtins. We added a scoped builtin without a
corresponding standard one before the fork so this should be added in
the release candidate. These were originally added in
https://github.com/llvm/llvm-project/pull/168666
Also, the name `uinc_wrap` does not follow the naming convention. The
GNU atomics use `fetch_xyz` to indicate that the builtin returns the
previous location's value as part of the RMW operation, which these do.
This PR renames it and its uses.
d5899ccb6f