[patch, fortran] Two associate fixes in dump-parse-tree.c

[Thomas Koenig]

Hello world,

the two fixes in the patch

- show ASSOCIATE lists if present, to complete the AST dump

- fix an ICE where an EXEC_END_BLOCK survived.  This can only
   happen if the END ASSOCIATE or END BLOCK statement had a
   statement label.

If the preference is to use some other format for the ASSOCIATE
lists, for example by putting each statement on its own list,
I am open to suggestions.

Regression-tested (but we don't really test for this).  No test
case because we don't have the infrastructure for it.

No user impact expected (nobody but us developers uses
-fdump-fortran-original, I think).

OK for trunk?

Regards

	Thomas

2016-02-14  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * dump-parse-tree.c (show_code_node):  Print association
         list of a block if present.  Handle EXEC_END_BLOCK.
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