[test] Temporarily remove benchmarks from deopt fuzzer

The tests currently time out due to too many deopt points and hence too many
tests generated.

TBR=sergiyb@chromium.org

Bug: v8:6900
Change-Id: I0998097024a4ed9c087728bb5ef288ab17d3371e
Reviewed-on: https://chromium-review.googlesource.com/876322Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50727}

tools/testrunner/deopt_fuzzer.py

@@ -26,7 +26,7 @@ from testrunner.local import verbose
 from testrunner.objects import context
 
 
-DEFAULT_SUITES = ["mjsunit", "webkit", "benchmarks"]
+DEFAULT_SUITES = ["mjsunit", "webkit"]
 TIMEOUT_DEFAULT = 60
 
 # Double the timeout for these: