Fix SEGV in ix86_in_large_data_p (PR target/71080)

	PR target/71080
	* config/i386/i386.c (ix86_in_large_data_p): Guard against NULL exp.

From-SVN: r236196

gcc/ChangeLog

+2016-05-13  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	PR target/71080
+	* config/i386/i386.c (ix86_in_large_data_p): Guard against NULL exp.
+
 2016-05-13  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* builtins.c (expand_builtin_memcmp): Do not emit the call here.

gcc/config/i386/i386.c

@@ -6823,6 +6823,9 @@ ix86_in_large_data_p (tree exp)
   if (ix86_cmodel != CM_MEDIUM && ix86_cmodel != CM_MEDIUM_PIC)
     return false;
 
+  if (exp == NULL_TREE)
+    return false;
+
   /* Functions are never large data.  */
   if (TREE_CODE (exp) == FUNCTION_DECL)
     return false;