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patch: remove unused sequence_stack declaration


sequence_stack is defined in struct function.  I don't see any use of this
extern declaration.

Tested by building the compiler on x86-64 Linux.

OK to remove?

	* function.h: Remove sequence_stack extern declaration.

Index: function.h
===================================================================
--- function.h	(revision 123746)
+++ function.h	(working copy)
@@ -46,8 +46,6 @@ struct sequence_stack GTY(())
   struct sequence_stack *next;
 };
 
-extern struct sequence_stack *sequence_stack;
-
 /* Stack of single obstacks.  */
 
 struct simple_obstack_stack


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