[build] Checkout Swift LLVM Bindings repo

Author: egorzhdan

utils/update_checkout/update-checkout-config.json

@@ -79,6 +79,8 @@
             "remote": { "id": "apple/swift-nio-ssl" } },
         "swift-experimental-string-processing": {
             "remote": { "id": "apple/swift-experimental-string-processing" } },
+        "swift-llvm-bindings": {
+            "remote": { "id": "apple/swift-llvm-bindings" } },
         "llvm-project": {
             "remote": { "id": "apple/llvm-project" } }
     },
@@ -88,6 +90,7 @@
             "aliases": ["swift/main", "main", "stable/20211026"],
             "repos": {
                 "llvm-project": "stable/20211026",
+                "swift-llvm-bindings": "stable/20211026",
                 "swift": "main",
                 "cmark": "gfm",
                 "llbuild": "main",
@@ -129,6 +132,7 @@
             "aliases": ["rebranch", "stable/20220421"],
             "repos": {
                 "llvm-project": "stable/20220421",
+                "swift-llvm-bindings": "stable/20220421",
                 "swift": "rebranch",
                 "cmark": "gfm",
                 "llbuild": "main",
@@ -371,6 +375,7 @@
                         "next-upstream", "upstream-with-swift"],
             "repos": {
                 "llvm-project": "next",
+                "swift-llvm-bindings": "llvm.org/main",
                 "swift": "next",
                 "cmark": "gfm",
                 "llbuild": "main",