[infra] Un-shard vm-kernel-precomp-mac-product-x64

Fixes: https://github.com/dart-lang/sdk/issues/49174
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-mac-product-x64-try
Change-Id: I6e6c95e50ca4fdf9316e5a370de4c60e017e6a6f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/251262
Reviewed-by: William Hesse <whesse@google.com>
diff --git a/tools/bots/test_matrix.json b/tools/bots/test_matrix.json
index b94faf7..3241913 100644
--- a/tools/bots/test_matrix.json
+++ b/tools/bots/test_matrix.json
@@ -1492,7 +1492,6 @@
         "vm-kernel-precomp-linux-release-simarm64",
         "vm-kernel-precomp-linux-release-simriscv32",
         "vm-kernel-precomp-linux-release-simriscv64",
-        "vm-kernel-precomp-mac-product-x64",
         "vm-kernel-precomp-mac-release-simarm64",
         "vm-kernel-precomp-mac-release-simarm64c",
         "vm-kernel-precomp-win-product-x64",
@@ -1523,6 +1522,30 @@
     },
     {
       "builders": [
+        "vm-kernel-precomp-mac-product-x64"
+      ],
+      "meta": {
+        "description": "This configuration is used by the vm kernel precomp builders lacking shard support."
+      },
+      "steps": [
+        {
+          "name": "build dart",
+          "script": "tools/build.py",
+          "arguments": [
+            "runtime",
+            "dart_precompiled_runtime"
+          ]
+        },
+        {
+          "name": "vm tests",
+          "arguments": [
+            "-ndartkp-${system}-${mode}-${arch}"
+          ]
+        }
+      ]
+    },
+    {
+      "builders": [
         "vm-kernel-precomp-linux-debug-x64",
         "vm-kernel-precomp-linux-debug-x64c",
         "vm-kernel-precomp-linux-debug-simarm",