[co19] Enable Subtyping tests

* Skip tests that use type aliases on analyzer configurations.
* Shard co19 test more on VM AOT builder (to avoid shard timeouts).

Change-Id: I5834091e91f229242329ee9e7456ca822d18c0b5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151223
Reviewed-by: Alexander Thomas <athom@google.com>

tests/co19/co19-co19.status

@@ -101,7 +101,6 @@ LanguageFeatures/Simple-bounds/dynamic/type-aliases/*: Skip # Not migrated to NN
 LanguageFeatures/Simple-bounds/static/*: Skip # Not migrated to NNBD
 LanguageFeatures/Simple-bounds/static/type-aliases/*: Skip # Not migrated to NNBD
 LanguageFeatures/Spread-collections/*: Skip # Not migrated to NNBD
-LanguageFeatures/Subtyping/*: Skip # Not migrated to NNBD
 LanguageFeatures/Super-bounded-types/*: Skip # Not migrated to NNBD
 LanguageFeatures/Super-mixins/*: Skip # Not migrated to NNBD
 LanguageFeatures/Triple-Shift/*: Skip # Not migrated to NNBD
@@ -309,6 +308,11 @@ LibTest/typed_data/Uint8ClampedList/*: Skip # Not migrated to NNBD
 LibTest/typed_data/Uint8List/*: Skip # Not migrated to NNBD
 Utils/tests/Expect/*: Skip # Not migrated to NNBD
 
+[ $compiler == dart2analyzer ]
+LanguageFeatures/Subtyping/static/tests/left_bottom_A01_t02: Skip # Type aliases are not supported by analyzer
+LanguageFeatures/Subtyping/static/tests/left_bottom_A01_t04: Skip # Type aliases are not supported by analyzer
+LanguageFeatures/Subtyping/static/tests/left_bottom_A01_t06: Skip # Type aliases are not supported by analyzer
+
 [ $compiler != fasta ]
 Language/Classes/Abstract_Instance_Members/inherited_t13: Skip # github.com/dart-lang/language/issues/115
 Language/Classes/Abstract_Instance_Members/inherited_t14: Skip # github.com/dart-lang/language/issues/115

tools/bots/test_matrix.json

@@ -1376,7 +1376,7 @@
             "co19"
           ],
           "fileset": "vm-kernel",
-          "shards": 1
+          "shards": 2
         },
         {
           "name": "co19 nnbd tests in strong mode",
@@ -1385,7 +1385,7 @@
             "co19"
           ],
           "fileset": "vm-kernel",
-          "shards": 1
+          "shards": 2
         },
         {
           "name": "vm nnbd tests in weak mode with asserts",