filter out AST in more plugins

I seem to have missed quite a few in

    commit 9f4d23c151
    filter out some of the AST in the plugins

This nets me another 14% improvement

Change-Id: I39b980b49ced560f768045dbedd3ddfef29306c1
Reviewed-on: https://gerrit.libreoffice.org/59501
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

compilerplugins/clang/pointerbool.cxx

@@ -23,11 +23,11 @@
 
 namespace
 {
-class PointerBool : public RecursiveASTVisitor<PointerBool>, public loplugin::Plugin
+class PointerBool : public loplugin::FilteringPlugin<PointerBool>
 {
 public:
     explicit PointerBool(loplugin::InstantiationData const& data)
-        : Plugin(data)
+        : FilteringPlugin(data)
     {
     }