[GTK][WKE] Pass the --memory-limited option on the GTK and WPE buildbots for the...

[GTK][WKE] Pass the --memory-limited option on the GTK and WPE buildbots for the JSC tests.
https://bugs.webkit.org/show_bug.cgi?id=175140

Reviewed by Alexey Proskuryakov.

We are having lately issues with JSC tests causing problems on
the GTK+ and WPE bots due to the high amount of memory some tests
need to run.

The best thing we can do now is to workaround this by disabling
all the tests marked as memoryLimited on the GTK and WPE bots.
We may revise this on the future.

* BuildSlaveSupport/build.webkit.org-config/master.cfg:
(RunJavaScriptCoreTests.start):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220221 268f45cc-cd09-0410-ab3c-d52691b4dbfc