Update update-checkout-config.json.

Update to swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a.
Though swift itself is not synced at swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a.

Author: dan-zheng

utils/update_checkout/update-checkout-config.json

@@ -329,29 +329,29 @@
         "tensorflow": {
             "aliases": ["tensorflow"],
             "repos": {
-                "llvm": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "clang": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
+                "llvm": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "clang": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
                 "swift": "tensorflow",
                 "lldb": "3fcea0aa6f93985c20075daa978ef2da5f47215f",
-                "cmark": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "llbuild": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "swiftpm": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
+                "cmark": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "llbuild": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "swiftpm": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
                 "swift-syntax": "ce19fd53c3137baa1c3370d9577c18f125934a04",
-                "swift-stress-tester": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "compiler-rt": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "swift-corelibs-xctest": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "swift-corelibs-foundation": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "swift-corelibs-libdispatch": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "swift-integration-tests": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "swift-xcode-playground-support": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
+                "swift-stress-tester": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "compiler-rt": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "swift-corelibs-xctest": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "swift-corelibs-foundation": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "swift-corelibs-libdispatch": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "swift-integration-tests": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "swift-xcode-playground-support": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
                 "ninja": "253e94c1fa511704baeb61cf69995bbf09ba435e",
                 "icu": "release-61-1",
-                "clang-tools-extra": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "libcxx": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
+                "clang-tools-extra": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "libcxx": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
                 "tensorflow": "ebc41609e27dcf0998d8970e77a2e1f53e13ac86",
                 "tensorflow-swift-apis": "2c7a1909bc42db91ba0e0032a3a1f395f684b16c",
-                "indexstore-db": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a",
-                "sourcekit-lsp": "swift-DEVELOPMENT-SNAPSHOT-2019-05-26-a"
+                "indexstore-db": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a",
+                "sourcekit-lsp": "swift-DEVELOPMENT-SNAPSHOT-2019-06-02-a"
             }
         }
     }