llvmPackages.lldb: combine out and lib outputs on Darwin

LLDB expects to find the location of `bin` relative to `lib`. Patching
it to know the location would cause a cycle between the `out` output and
the `lib` output, so combine the two on Darwin.

Fixes https://github.com/NixOS/nixpkgs/issues/252838.

pkgs/development/compilers/llvm/common/lldb.nix

@@ -50,7 +50,9 @@ stdenv.mkDerivation (rec {
   src = src';
   inherit patches;
 
-  outputs = [ "out" "lib" "dev" ];
+  # LLDB expects to find the path to `bin` relative to `lib` on Darwin. It can’t be patched with the location of
+  # the `lib` output because that would create a cycle between it and the `out` output.
+  outputs = [ "out" "dev" ] ++ lib.optionals (!stdenv.isDarwin) [ "lib" ];
 
   sourceRoot = lib.optional (lib.versionAtLeast release_version "13") "${src.name}/${pname}";