minor change

Author: diggerlin

llvm/test/CodeGen/PowerPC/undef-args.ll

@@ -1,4 +1,7 @@
-;; Tests that load 0 into argument registers for unused arguments are eliminated. 
+;; Tests that extending poison results in poison.
+;; Also tests that there are no redundant instructions loading 0 into argument registers for unused arguments.
+
+; REQUIRES: asserts
 
 ; RUN: llc -verify-machineinstrs -mtriple powerpc-ibm-aix-xcoff -debug-only=isel \
 ; RUN:   %s -o - 2>&1 | FileCheck --check-prefix=CHECKISEL32 %s