Use not instead of ignore when an exit status is expected to always
be non-zero.

llvm-svn: 44866
diff --git a/llvm/test/Feature/globalredefinition3.ll b/llvm/test/Feature/globalredefinition3.ll
index 9906c06..d40d3e9 100644
--- a/llvm/test/Feature/globalredefinition3.ll
+++ b/llvm/test/Feature/globalredefinition3.ll
@@ -1,4 +1,4 @@
-; RUN: ignore llvm-as < %s -o /dev/null -f |& grep \
+; RUN: not llvm-as < %s -o /dev/null -f |& grep \
 ; RUN:   "Redefinition of global variable named 'B'"
 ; END.