for processingInstruction method in XFastDocumentHandler
and for XFastNamespaceHandler API.

Change-Id: Ie0fd8ceb42e7ffbce041796b98edaa7f232dbb62
Reviewed-on: https://gerrit.libreoffice.org/38964Reviewed-by: Mohammed Abdul Azeem <azeemmysore@gmail.com>
Tested-by: Mohammed Abdul Azeem <azeemmysore@gmail.com>