[Bug lto/54709] [4.8 Regression] r191713 breaks Firefox build

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54709

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-26 11:56:37 UTC ---
Seems that doesn't work (yeah, the builtin defs issue ... bah).  The following
might (w/o reverting the previous change):

Index: gcc/tree.h
===================================================================
--- gcc/tree.h  (revision 191756)
+++ gcc/tree.h  (working copy)
@@ -2617,7 +2617,7 @@ struct function;
 #define DECL_SOURCE_LINE(NODE) LOCATION_LINE (DECL_SOURCE_LOCATION (NODE))
 #define DECL_SOURCE_COLUMN(NODE) LOCATION_COLUMN (DECL_SOURCE_LOCATION (NODE))
 #define DECL_IS_BUILTIN(DECL) \
-  (DECL_SOURCE_LOCATION (DECL) <= BUILTINS_LOCATION)
+  (LOCATION_LOCUS (DECL_SOURCE_LOCATION (DECL)) <= BUILTINS_LOCATION)

 /*  For FIELD_DECLs, this is the RECORD_TYPE, UNION_TYPE, or
     QUAL_UNION_TYPE node that the field is a member of.  For VAR_DECL,