6921494: provide way to print javac tree tag values
Reviewed-by: jjg, mcimadamore
Contributed-by: vicenterz@yahoo.es

6982992: Tests CheckAttributedTree.java, JavacTreeScannerTest.java, and SourceTreeeScannerTest.java timeout
Summary: Hoist some invariant code out of a loop
Reviewed-by: ksrini

6985115: tests create too much output
Reviewed-by: mcimadamore

6983239: TreeScanner does not scan default value for method
Reviewed-by: mcimadamore