Simplify translate_clast_* methods

2009-11-23  Tobias Grosser  <grosser@fim.uni-passau.de>

	* graphite-clast-to-gimple.c (translate_clast_user,
	translate_clast_for, translate_clast_guard): Simplify and move common
	elements to translate_clast().
	(translate_clast): Simplify and get common elements.

From-SVN: r154847