V8: increase number of shards for arm64 gc stress.

scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___arm64___sim___gc_stress.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "client.v8.ports",
       "--builder",
       "V8 Linux - arm64 - sim - gc stress",
@@ skipping 320 matching lines @@
       "-u",
       "[SLAVE_BUILD]/v8/tools/swarming_client/swarming.py",
       "trigger",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--isolate-server",
       "https://isolateserver.appspot.com",
       "--priority",
       "35",
       "--shards",
-      "3",
+      "4",
       "--task-name",
       "Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571",
       "--dump-json",
       "/path/to/tmp/json",
       "--expiration",
       "7200",
       "--io-timeout",
       "1200",
       "--hard-timeout",
       "2700",
@@ skipping 50 matching lines @@
       "--rerun-failures-count=2",
       "--swarming",
       "--json-test-results",
       "${ISOLATED_OUTDIR}/output.json"
     ],
     "name": "[trigger] Mjsunit on Ubuntu-12.04",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"tasks\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:3:0\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:0\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 0, @@@",
       "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10000\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }, @@@",
-      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:3:1\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:1\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 1, @@@",
       "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10100\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10100\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }, @@@",
-      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:3:2\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:2\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 2, @@@",
       "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10200\", @@@",
       "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10200\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:3\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 3, @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10300\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10300\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@STEP_LINK@shard #0@https://chromium-swarm.appspot.com/user/task/10000@@@",
       "@@@STEP_LINK@shard #1@https://chromium-swarm.appspot.com/user/task/10100@@@",
-      "@@@STEP_LINK@shard #2@https://chromium-swarm.appspot.com/user/task/10200@@@"
+      "@@@STEP_LINK@shard #2@https://chromium-swarm.appspot.com/user/task/10200@@@",
+      "@@@STEP_LINK@shard #3@https://chromium-swarm.appspot.com/user/task/10300@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]/v8/tools/swarming_client/swarming.py",
       "trigger",
       "--swarming",
       "https://chromium-swarm.appspot.com",
@@ skipping 96 matching lines @@
       "[TMP_BASE]",
       "--merged-test-output",
       "/path/to/tmp/json",
       "--",
       "collect",
       "--swarming",
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--json",
-      "{\"base_task_name\": \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571\", \"tasks\": {\"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:3:0\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}, \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:3:1\": {\"shard_index\": 1, \"task_id\": \"10100\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10100\"}, \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:3:2\": {\"shard_index\": 2, \"task_id\": \"10200\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10200\"}}}"
+      "{\"base_task_name\": \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571\", \"tasks\": {\"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:0\": {\"shard_index\": 0, \"task_id\": \"10000\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"}, \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:1\": {\"shard_index\": 1, \"task_id\": \"10100\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10100\"}, \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:2\": {\"shard_index\": 2, \"task_id\": \"10200\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10200\"}, \"Mjsunit/Ubuntu-12.04/[dummy has/V8 Linux - arm64 - sim - gc stress/571:4:3\": {\"shard_index\": 3, \"task_id\": \"10300\", \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10300\"}}}"
     ],
     "name": "Mjsunit",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@durations@01:01:002 mjsunit/Cool.Test@@@",
       "@@@STEP_LOG_LINE@durations@00:00:101 mjsunit/Cool.Test2@@@",
       "@@@STEP_LOG_LINE@durations@@@@",
       "@@@STEP_LOG_LINE@durations@Details:@@@",
       "@@@STEP_LOG_LINE@durations@@@@",
       "@@@STEP_LOG_LINE@durations@Test: mjsunit/Cool.Test@@@",
       "@@@STEP_LOG_LINE@durations@Flags: -f@@@",
@@ skipping 44 matching lines @@
       "@@@STEP_LOG_LINE@durations@Duration: 00:00:101@@@",
       "@@@STEP_LOG_END@durations@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]