[dyn_modules] Add vm-dyn-linux-debug-x64 builder

Change-Id: I53b631931b600c1c22ee538a70b30b5ec9263d1c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/426520
Reviewed-by: Sigmund Cherem <[email protected]>
Commit-Queue: Alexander Markov <[email protected]>

Author: alexmarkov

tools/bots/test_matrix.json

@@ -1328,6 +1328,36 @@
         }
       ]
     },
+    {
+      "builders": [
+        "vm-dyn-linux-debug-x64"
+      ],
+      "meta": {
+        "description": "This configuration is used by the dynamic modules VM JIT builders."
+      },
+      "steps": [
+        {
+          "name": "build dart",
+          "script": "tools/build.py",
+          "arguments": [
+            "--dart-dynamic-modules",
+            "runtime",
+            "runtime_precompiled",
+            "utils/gen_kernel"
+          ]
+        },
+        {
+          "name": "vm tests",
+          "arguments": [
+            "-nvm-dyn-${system}-${mode}-${arch}",
+            "corelib",
+            "language"
+          ],
+          "fileset": "vm",
+          "shards": 5
+        }
+      ]
+    },
     {
       "builders": [
         "vm-asan-linux-release-x64",