Use clang -cc1 in test, to improve determinism.

llvm-svn: 91236
diff --git a/clang/test/CodeGenObjC/property-list-in-class.m b/clang/test/CodeGenObjC/property-list-in-class.m
index 725a1c3..b20a681 100644
--- a/clang/test/CodeGenObjC/property-list-in-class.m
+++ b/clang/test/CodeGenObjC/property-list-in-class.m
@@ -1,4 +1,4 @@
-// RUN: clang -m64 -fobjc-nonfragile-abi -S -emit-llvm -o %t %s
+// RUN: clang-cc -fobjc-nonfragile-abi -emit-llvm -o - %s
 // FIXME. Test is incomplete.
 
 @protocol P