Turn on DCHECKs and other debugging code if dcheck_always_on is 1

test/webkit/webkit.status

Index: test/webkit/webkit.status
diff --git a/test/webkit/webkit.status b/test/webkit/webkit.status
index 89a5cab24d43ea7d30a065b9de7710faeda7527c..21ee4700e83e04a7d27d7ed8cd7f61e18886d4a0 100644
--- a/test/webkit/webkit.status
+++ b/test/webkit/webkit.status
@@ -57,6 +57,10 @@
 ['arch == arm64 and simulator_run == True', {
   'dfg-int-overflow-in-loop': [SKIP],
 }],  # 'arch == arm64 and simulator_run == True'
+['dcheck_always_on == True and arch == arm64', {
+  # Doesn't work with gcc 4.6 on arm64 for some reason.
+  'reentrant-caching': [SKIP],
+}],  # 'dcheck_always_on == True and arch == arm64'
 
 
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