Add missing quotes for -###.

Sorry about forgetting to include this in the previous patch.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@186946 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Driver/x86_64-nacl-defines.cpp b/test/Driver/x86_64-nacl-defines.cpp
index 2154daa..87d02d7 100644
--- a/test/Driver/x86_64-nacl-defines.cpp
+++ b/test/Driver/x86_64-nacl-defines.cpp
@@ -2,7 +2,7 @@
 // RUN: %clang -target x86_64-unknown-nacl %s -emit-llvm -S -c -o - | FileCheck %s
 // RUN: %clang -target x86_64-unknown-nacl %s -emit-llvm -S -c -pthread -o - | FileCheck %s -check-prefix=THREADS
 
-// ECHO: {{.*}} -cc1 {{.*}}x86_64-nacl-defines.c
+// ECHO: {{.*}} "-cc1" {{.*}}x86_64-nacl-defines.c
 
 // Check platform defines