...as it was the last remaining enabled-by-default plugin that calls expensive
parentStmt.  It isn't immediately clear to me how to rewrite the plugin to not
call that, but a superset of this plugin's warnings are now also emitted by
GCC 6 -Wmisleading-indentation.

Change-Id: Ifa55cb14f6763594fe48926585df29d4d30355df