gnat.exp: Fix comments.

gnat.exp: Fix comments.

	* lib/gnat.exp: Fix comments.
	Don't load libgloss.exp.
	(default_gnat_version): Call $compiler with --version.
	Adapt regexp for gnatmake output, insert version.
	(gnat_version): New proc.
	(gnat_init): Remove gnat_libgcc_s_path.
	(gnat_target_compile): Likewise.
	Remove ld_library_path.
	Log ADA_INCLUDE_PATH, ADA_OBJECTS_PATH.
	(gnat_pass): Remove.
	(gnat_pass): Remove.
	(gnat_finish): Remove.
	(gnat_exit): Remove.
	(local_find_gnatmake): Reindent.
	(runtest_file_p): Remove.
	(prune_warnings): Remove.
	(find_gnatclean): New proc.
	* lib/gnat-dg.exp (lremove): New proc.
	(gnat-dg-test): Reindent.
	Remove additional output files.
	(gnat-dg-runtest): Remove.

	* gnat.dg/array7.adb: Use cleanup-tree-dump "optimized".
	* gnat.dg/loop_optimization6.adb: Likewise.
	* gnat.dg/atomic1.adb: Use cleanup-tree-dump "gimple".

From-SVN: r170404