Add push config for swift/master LLDB pushes

apple-llvm-split-commit: b7eb3515f7c63a695f5e0eb466ac1b0d91a55a7a
apple-llvm-split-dir: -

Author: hyp

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

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