tcwg-llvmbot: Move flang-aarch64-libcxx to silent

While fallout from flang-rt changes and https://github.com/llvm/llvm-project/pull/134990
is dealt with.

Change-Id: Ie9e3b925343c444459b39c1e42d6cad4c7f34ca4
diff --git a/monitor/linaro.json b/monitor/linaro.json
index 13764ed..427a6db 100644
--- a/monitor/linaro.json
+++ b/monitor/linaro.json
@@ -76,7 +76,20 @@
           { "name": "flang-aarch64-release" },
           { "name": "flang-aarch64-debug-reverse-iteration" },
           { "name": "flang-aarch64-rel-assert" },
-          { "name": "flang-aarch64-latest-gcc" },
+          { "name": "flang-aarch64-latest-gcc" }
+        ]
+      }
+    ]
+  },
+  {
+    "name": "LLVM Silent Master",
+    "base_url": "https://lab.llvm.org/staging",
+    "builder_url": "builders",
+    "build_url": "builds",
+    "builders": [
+      {
+        "name": "Flang",
+        "bots": [
           { "name": "flang-aarch64-libcxx" }
         ]
       }