Add test methods in AccessFlags.

-isContructor()
-isInterface()
-isEnum()

cherry-pick from commit f26560e364a6cdbea0e634c67bc5568fd77da489
partial cherry-pick from 89781f1a88104ce3f6dc680d1cf0b9975325c2de
for isEnum().

Change-Id: Id671442c1fe6113809a21c63a54ae6e290d899e2
1 file changed