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

llvm-svn: 44866
diff --git a/llvm/test/Assembler/2005-01-31-CallingAggregateFunction.ll b/llvm/test/Assembler/2005-01-31-CallingAggregateFunction.ll
index 366bd73..9fb8054 100644
--- a/llvm/test/Assembler/2005-01-31-CallingAggregateFunction.ll
+++ b/llvm/test/Assembler/2005-01-31-CallingAggregateFunction.ll
@@ -1,4 +1,4 @@
-; RUN: ignore llvm-as < %s -o /dev/null -f |& \
+; RUN: not llvm-as < %s -o /dev/null -f |& \
 ; RUN:    grep {LLVM functions cannot return aggregate types}
 
 define void @test() {