* lib/gcc-dg.exp: Load scanipa.exp.
        (cleanup-dump): New procedure.
        (cleanup-rtl-dump, cleanup-tree-dump, cleanup-ipa-dump): Use it.
        * lib/scandump.exp: New file.
        * lib/scantree.exp: Use it.
        * lib/scanipa.exp: New file.

From-SVN: r104244