llvmbot monitor: Move armv8-lld-2stage to silent

I am testing this with fixed core counts in silent mode.

Change-Id: I5148f1c8f0c1a6e47fc3c912274cb080d26bae7e
diff --git a/monitor/linaro.json b/monitor/linaro.json
index 115fa34..02c03a7 100644
--- a/monitor/linaro.json
+++ b/monitor/linaro.json
@@ -15,8 +15,7 @@
       {
         "name": "Full Bots (LLVM, Clang, Compiler-RT, Testsuite, 2-Stage)",
         "bots": [
-          { "name": "clang-aarch64-lld-2stage" },
-          { "name": "clang-armv8-lld-2stage" }
+          { "name": "clang-aarch64-lld-2stage" }
         ]
       },
       {
@@ -98,7 +97,8 @@
       {
         "name": "Full Bots (LLVM, Clang, Compiler-RT, Testsuite, 2-Stage)",
         "bots": [
-          { "name": "clang-aarch64-full-2stage" }
+          { "name": "clang-aarch64-full-2stage" },
+          { "name": "clang-armv8-lld-2stage" }
         ]
       }
     ]