external declaration of dominance debug functions

[Piervit <piervit@pvittet.com>]

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Hello,

Here is a two lines patch, allowing to use debug_dominance_info and
debug_dominance_tree functions outside of gcc/dominance.c. For the
moment, those functions are not declared in any gcc/*.h files (as far as
I know after trying a grep). I have added them as external functions
into gcc/basic-block.h. I feel this is useful to be able to call those
functions from others files, for exemple from plugins.

ChangeLog:

2011-05-23  Pierre Vittet  <piervit@pvittet.com>

	* basic-block.h (debug_dominance_info, debug_dominance_tree):
	  Add declaration.

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Index: gcc/basic-block.h
===================================================================
--- gcc/basic-block.h	(revision 174056)
+++ gcc/basic-block.h	(working copy)
@@ -882,6 +882,9 @@ extern basic_block get_bb_copy (basic_block);
 void set_loop_copy (struct loop *, struct loop *);
 struct loop *get_loop_copy (struct loop *);
 
+extern void debug_dominance_info (enum cdi_direction dir);
+extern void debug_dominance_tree (enum cdi_direction dir, basic_block root);
+
 #include "cfghooks.h"
 
 /* Return true when one of the predecessor edges of BB is marked with EDGE_EH.  */