[test] Skip slow test.

NOTRY=true

Review URL: https://codereview.chromium.org/1179693005

Cr-Commit-Position: refs/heads/master@{#28941}

test/webkit/webkit.status

@@ -49,9 +49,11 @@
 }],  # 'mode == debug'
 ['simulator', {
   # Skip tests that timeout with turbofan.
-  'dfg-int-overflow-in-loop': [PASS, NO_VARIANTS],
   'array-iterate-backwards': [PASS, NO_VARIANTS],
   'function-apply-aliased': [SKIP],
+
+  # Skip tests that are too slow for simulators.
+  'dfg-int-overflow-in-loop': [SKIP],
 }],  # 'simulator'
 ['arch == arm64 and simulator_run == True', {
   'dfg-int-overflow-in-loop': [SKIP],