GLSLTest_ES3.LargeNumberOfFloat4Parameters/ES3_OPENGL started crashing
after the parallel compile enablement on OpenGL and disabling the
workers didn't fix it.

BUG=angleproject:3087

Change-Id: I317b140e66b04102059486381ef70e16600fad12
Reviewed-on: https://chromium-review.googlesource.com/c/1419007Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>