[patch, fortran] Introducing -fdump-optimized-tree

[Thomas Koenig]

Hello world,

here's a patch for dumping the optimized tree after front-end
optimization.  Regression-tested (not that I expected to find anything
there...).  Tested with 'make dvi' and 'make info'. OK for trunk?

	Thomas

2010-10-24  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.h (gfc_option_t):  Add dump_optimized_tree.
	* lang.opt:  Add fdump-optimized-tree.
	* gfortran.texi:  Adjust description of fdump-parse-tree to
	the presence of fdump-optimized-tree.  Add description of
	fdump-optimized-tree.
	* frontend-passes.c (gfc_run_passes):  If optimizing and
	if fdump-optimized-tree is set, dump the parse tree after
	optimization.
	* options.c (gfc_init_options):  Initialize dump_optimized_tree.
	(gfc_handle_option):  Handle dump_optimized_tree.

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