Remove MIPS support

tools/gardening/lib/src/shard_data.dart

Index: tools/gardening/lib/src/shard_data.dart
diff --git a/tools/gardening/lib/src/shard_data.dart b/tools/gardening/lib/src/shard_data.dart
index 7b607e3bf9bd50f43121a87426ebf9df693cddde..68c1aab129690213860fc2467ad4ddf09346db11 100644
--- a/tools/gardening/lib/src/shard_data.dart
+++ b/tools/gardening/lib/src/shard_data.dart
@@ -22,8 +22,6 @@ const Map<String, List<String>> shardGroups = const {
     'vm-win-release-x64-be',
     'vm-win-debug-ia32-be',
     'vm-win-release-ia32-be',
-    'vm-linux-debug-simmips-be',
-    'vm-linux-release-simmips-be',
     'vm-linux-debug-simarm-be',
     'vm-linux-release-simarm-be',
     'vm-linux-release-simarm64-be',
@@ -180,8 +178,6 @@ const Map<String, List<String>> shardGroups = const {
     'vm-win-release-x64-dev',
     'vm-win-debug-ia32-dev',
     'vm-win-release-ia32-dev',
-    'vm-linux-debug-simmips-dev',
-    'vm-linux-release-simmips-dev',
     'vm-linux-debug-simarm-dev',
     'vm-linux-release-simarm-dev',
     'vm-linux-release-simarm64-dev',
@@ -366,8 +362,6 @@ const Map<String, List<String>> shardGroups = const {
     'vm-win-release-x64-stable',
     'vm-win-debug-ia32-stable',
     'vm-win-release-ia32-stable',
-    'vm-linux-debug-simmips-stable',
-    'vm-linux-release-simmips-stable',
     'vm-linux-debug-simarm-stable',
     'vm-linux-release-simarm-stable',
     'vm-linux-release-simarm64-stable',