V8: Use default compiler where possible

scripts/slave/recipes/v8.expected/full_tryserver_v8_v8_linux64_rel_ng.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "tryserver.v8",
       "--builder",
       "v8_linux64_rel_ng",
@@ skipping 129 matching lines @@
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]/v8",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
-      "GYP_DEFINES": "clang=1 dcheck_always_on=1 fastbuild=1 gomadir='[CACHE]/cipd/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
+      "GYP_DEFINES": "dcheck_always_on=1 fastbuild=1 gomadir='[CACHE]/cipd/goma' target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
       "GYP_GENERATORS": "ninja",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py",
@@ skipping 55 matching lines @@
     ],
     "name": "rmtree [TMP_BASE]/v8_gn_tmp_1",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import shutil, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@shutil.rmtree(sys.argv[1])@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
-    "allow_subannotations": true,
-    "cmd": [
-      "python",
-      "-u",
-      "RECIPE_PACKAGE_REPO[build]/scripts/slave/clang_revision.py",
-      "--src-dir",
-      "[SLAVE_BUILD]/v8",
-      "--output-json",
-      "/path/to/tmp/json"
-    ],
-    "env": {
-      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
-    },
-    "name": "clang_revision",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"clang_revision\": \"123456-7\"@@@",
-      "@@@STEP_LOG_LINE@json.output@}@@@",
-      "@@@STEP_LOG_END@json.output@@@"
-    ]
-  },
-  {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/compile.py",
       "--gsutil-py-path",
       "RECIPE_PACKAGE_REPO[depot_tools]/gsutil.py",
       "--ninja-path",
       "RECIPE_PACKAGE_REPO[depot_tools]/ninja",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/v8",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--build-tool",
       "ninja",
       "--compiler",
-      "goma-clang",
+      "goma",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
       "--goma-service-account-json-file",
       "/creds/service_accounts/service-account-goma-client.json",
       "--goma-dir",
       "[CACHE]/cipd/goma",
       "--goma-fail-fast",
       "--goma-disable-local-fallback",
       "--"
     ],
@@ skipping 44 matching lines @@
     "cmd": [],
     "name": "trigger",
     "trigger_specs": [
       {
         "builder_name": "v8_linux64_rel_ng_triggered",
         "properties": {
           "category": "cq",
           "issue": 12853011,
           "master": "tryserver.v8",
           "parent_build_environment": {
-            "GYP_DEFINES": "clang=1 dcheck_always_on=1 fastbuild=1 target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
+            "GYP_DEFINES": "dcheck_always_on=1 fastbuild=1 target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_target_arch=x64",
             "GYP_GENERATORS": "ninja"
           },
           "parent_got_revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "parent_got_revision_cp": "refs/heads/master@{#50110}",
           "parent_got_swarming_client_revision": "e4fee0b18f8163be6097c9c571640038896debc4",
           "patch_project": "v8",
           "patch_storage": "rietveld",
           "patchset": "1",
           "reason": "CQ",
           "requester": "commit-bot@chromium.org",
@@ skipping 14 matching lines @@
     "~followup_annotations": [
       "@@@STEP_TEXT@v8_linux64_rel_ng_triggered@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]