[backport from gcc-4.8/trunk r188869 <mikpe@it.uu.se>]

gcc/

2012-06-21  Alexandre Oliva  <aoliva@redhat.com>

	PR debug/53671
	PR debug/49888
	* var-tracking.c (vt_init_cfa_base): Drop redundant recording of
	CFA base.

--- gcc-4.7.1/gcc/var-tracking.c.~1~	2012-08-12 13:11:31.000000000 +0200
+++ gcc-4.7.1/gcc/var-tracking.c	2012-08-12 13:14:07.000000000 +0200
@@ -9410,9 +9410,6 @@ vt_init_cfa_base (void)
 				 VOIDmode, get_insns ());
   preserve_value (val);
   cselib_preserve_cfa_base_value (val, REGNO (cfa_base_rtx));
-  var_reg_decl_set (&VTI (ENTRY_BLOCK_PTR)->out, cfa_base_rtx,
-		    VAR_INIT_STATUS_INITIALIZED, dv_from_value (val->val_rtx),
-		    0, NULL_RTX, INSERT);
 }
 
 /* Allocate and initialize the data structures for variable tracking