Unbreak mtoctf configure check.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5760 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index e1dfab8..3d55972 100644
--- a/configure.in
+++ b/configure.in
@@ -568,8 +568,8 @@
 AC_MSG_CHECKING([if ppc32/64 as supports mtocrf/mfocrf])
 
 AC_TRY_COMPILE(, [
-__asm__ __volatile__("mtocrf 0,0");
-__asm__ __volatile__("mfocrf 0,0");
+__asm__ __volatile__("mtocrf 4,0");
+__asm__ __volatile__("mfocrf 0,4");
 ],
 [
 ac_have_as_ppc_mftocrf=yes