Add push config for swift/master-next LLDB pushes

apple-llvm-split-commit: 22d02f3126479e3bfb01d5af90def72e87db051a
apple-llvm-split-dir: -

Author: hyp

apple-llvm-config/push/swift-master-next.json

@@ -0,0 +1,8 @@
+{
+  "branch_to_dest_branch_mapping": {
+    "swift/master-next:lldb": "upstream-with-swift",
+  },
+  "repo_mapping": {
+    "lldb": "https://github.com/apple/swift-lldb.git"
+  }
+}