Add infrastructure for skipping tests in GC stress mode.

test/mjsunit/regress/regress-165637.js

Index: test/mjsunit/regress/regress-165637.js
diff --git a/test/mjsunit/regress/regress-165637.js b/test/mjsunit/regress/regress-165637.js
index 72af528a86b5e622fb5d802638672e66e1b9d183..84c9041216cb6045c036054b67e470c7615f5639 100644
--- a/test/mjsunit/regress/regress-165637.js
+++ b/test/mjsunit/regress/regress-165637.js
@@ -45,10 +45,6 @@ function do_slices() {
   return Date.now() - start;
 }
 
-// Reset the GC stress mode to be off. Needed so that the runtime of this test
-// stays within bounds even if we run in GC stress mode.
-%SetFlags("--gc-interval=-1 --noforce-marking-deque-overflows");
-
 // Should never take more than 3 seconds (if the bug is fixed, the test takes
 // considerably less time than 3 seconds).
 assertTrue(do_slices() < (3 * 1000));