Merge pull request #13846 from apple/update-checkout-config-for-swift5

diff --git a/utils/update-checkout-config.json b/utils/update-checkout-config.json
index 6fae3ab..1cb2a71 100644
--- a/utils/update-checkout-config.json
+++ b/utils/update-checkout-config.json
@@ -187,6 +187,25 @@
                 "swift-xcode-playground-support": "swift-4.0-branch",
                 "ninja": "release"
             }
+        },
+        "swift-5.0-branch" : {
+            "aliases": ["swift-5.0-branch"],
+            "repos": {
+                "llvm": "swift-4.1-branch",
+                "clang": "swift-4.1-branch",
+                "swift": "swift-5.0-branch",
+                "lldb": "swift-5.0-branch",
+                "cmark": "master",
+                "llbuild": "master",
+                "swiftpm": "master",
+                "compiler-rt": "swift-4.1-branch",
+                "swift-corelibs-xctest": "master",
+                "swift-corelibs-foundation": "master",
+                "swift-corelibs-libdispatch": "master",
+                "swift-integration-tests": "master",
+                "swift-xcode-playground-support": "master",
+                "ninja": "release"
+            }
         }
     }
 }