Tweak test to pass -ffreestanding, to avoid platform dependent header issues.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@114627 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/arm-vector-arguments.c b/test/CodeGen/arm-vector-arguments.c
index 0d28642..68ceca0 100644
--- a/test/CodeGen/arm-vector-arguments.c
+++ b/test/CodeGen/arm-vector-arguments.c
@@ -3,6 +3,7 @@
 // RUN:   -target-cpu cortex-a8 \
 // RUN:   -mfloat-abi soft \
 // RUN:   -target-feature +soft-float-abi \
+// RUN:   -ffreestanding \
 // RUN:   -emit-llvm -w -o - %s | FileCheck %s
 
 #include <arm_neon.h>