[testsuite] XFAIL gcc.c-torture/execute/stkalign.c on SPARC 64-bit

[Eric Botcazou]

This test is very convoluted, doesn't contain a single line of comment and 
apparently makes an invalid assumption (see PR testsuite/68886).

Tested on x86-64/Linux and SPARC64/Solaris, applied on the mainline.


2016-01-26  Eric Botcazou  <ebotca...@adacore.com>

        * gcc.c-torture/execute/stkalign.c: XFAIL run on SPARC 64-bit.

-- 
Eric Botcazou
Index: gcc.c-torture/execute/stkalign.c
===================================================================
--- gcc.c-torture/execute/stkalign.c	(revision 232773)
+++ gcc.c-torture/execute/stkalign.c	(working copy)
@@ -1,3 +1,4 @@
+/* { dg-xfail-run-if "invalid assumption" { sparc*-*-* && lp64 } "*" "" } */
 /* { dg-options "-fno-inline" } */
 
 #include <assert.h>