[patch, fortran] Some cleanup / fixes in front-end statement walker

[Thomas Koenig]

Hello world,

working on PR 50690, I noticed a few things which are
not quite right in front-end optimization statement
walking:

- BLOCKs were walked via their namespaces, not directly.
   This caused out-of-order walking, which was confusing.
- current_ns was not marked static.
- ASSOCIATE lists were not walked.

This patch corrects these things.  Regression-tested.
OK for trunk?  (I will not be able to commit for a few
days due to business travel, unless somebody is _really_
fast :-)

	Thomas

2011-10-16  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * frontend-passes.c (current_ns):  Make static.
         (create_var):  Note parent of newly created namespace.
         (optimize_namespace):  Don't wak sibling namespaces
         if they are EXEC_BLOCK because this is handled...
         (gfc_code_walker):  ... here.  Also walk ASSOCIATE lists.
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