[CFE] Shard strong suite in unit_test_suites more

Before this CL the weak suite had 10 shards but the strong suite only
had 2 shards.
This CL makes the strong suite have 10 shards as well.

Change-Id: Ia1b228ed7159b7b2ca04d2ea12abe57f2b1a2658
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/365828
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
diff --git a/pkg/front_end/test/unit_test_suites.dart b/pkg/front_end/test/unit_test_suites.dart
index 3928f31..def6363 100644
--- a/pkg/front_end/test/unit_test_suites.dart
+++ b/pkg/front_end/test/unit_test_suites.dart
@@ -390,7 +390,7 @@
     strong.createContext,
     "../../testing.json",
     path: "fasta/strong_suite.dart",
-    shardCount: 2,
+    shardCount: 10,
   ),
   const Suite(
     "incremental_bulk_compiler_smoke",