[infra] Add shadow opt-in builder for V8 Linux64 - gcov coverage

Bug: v8:11594
Change-Id: I29dd481a22ee3c131807293664154865e7990098
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2810781
Commit-Queue: Almothana Athamneh <almuthanna@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73863}

infra/mb/mb_config.pyl

@@ -208,6 +208,7 @@
       'v8_linux64_dict_tracking_dbg_ng': 'debug_x64_dict_tracking_trybot',
       'v8_linux64_gc_stress_custom_snapshot_dbg_ng': 'debug_x64_trybot_custom',
       'v8_linux64_gcc_compile_dbg': 'debug_x64_gcc',
+      'v8_linux64_gcov_coverage': 'release_x64_gcc_coverage',
       'v8_linux64_header_includes_dbg': 'debug_x64_header_includes',
       'v8_linux64_fyi_rel_ng': 'release_x64_test_features_trybot',
       'v8_linux64_nodcheck_rel_ng': 'release_x64',

infra/testing/builders.pyl

@@ -373,18 +373,6 @@
     # TODO(almuthanna): Add a new test config for the fuzzilli suite.
     'tests': [],
   },
-  'v8_linux64_gc_stress_custom_snapshot_dbg_ng_triggered': {
-    'swarming_dimensions' : {
-      'os': 'Ubuntu-16.04',
-    },
-    'tests': [
-      {
-        'name': 'mjsunit',
-        'test_args': ['--gc-stress', '--no-harness'],
-        'shards': 3,
-      },
-    ],
-  },
   'v8_linux64_fyi_rel_ng_triggered': {
     'swarming_dimensions' : {
       'os': 'Ubuntu-16.04',
@@ -403,6 +391,26 @@
       {'name': 'mjsunit', 'variant': 'concurrent_inlining'},
     ],
   },
+  'v8_linux64_gc_stress_custom_snapshot_dbg_ng_triggered': {
+    'swarming_dimensions' : {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {
+        'name': 'mjsunit',
+        'test_args': ['--gc-stress', '--no-harness'],
+        'shards': 3,
+      },
+    ],
+  },
+  'v8_linux64_gcov_coverage': {
+    'swarming_dimensions' : {
+      'os': 'Ubuntu-16.04',
+    },
+    'tests': [
+      {'name': 'v8testing'},
+    ],
+  },
   'v8_linux64_msan_rel_ng_triggered': {
     'swarming_dimensions' : {
       'os': 'Ubuntu-16.04',