[test] Run gc fuzzer on benchmarks test suite

Bug: v8:6917
Change-Id: I0ee15a41b6028bdbf8448f066b0bc47a049ca587
Reviewed-on: https://chromium-review.googlesource.com/868154Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michał Majewski <majeski@google.com>
Cr-Commit-Position: refs/heads/master@{#50647}

tools/BUILD.gn

@@ -50,6 +50,7 @@ v8_isolate_run("run-gcmole") {
   isolate = "gcmole/run-gcmole.isolate"
 }
 
+# TODO(machenbach): Add tests as dependencies.
 v8_isolate_run("run-num-fuzzer") {
   deps = [
     "..:d8_run",

tools/run-num-fuzzer.isolate

@@ -14,6 +14,7 @@
   'includes': [
     'testrunner/testrunner.isolate',
     '../src/d8.isolate',
+    '../test/benchmarks/benchmarks.isolate',
     '../test/mjsunit/mjsunit.isolate',
     '../test/webkit/webkit.isolate',
   ],

tools/testrunner/gc_fuzzer.py

@@ -27,7 +27,7 @@ from testrunner.local import verbose
 from testrunner.objects import context
 
 
-DEFAULT_SUITES = ["mjsunit", "webkit"]
+DEFAULT_SUITES = ["mjsunit", "webkit", "benchmarks"]
 TIMEOUT_DEFAULT = 60
 
 # Double the timeout for these: