Fix typo in r184308.

llvm-svn: 184391
diff --git a/clang/test/Driver/gcc_forward.c b/clang/test/Driver/gcc_forward.c
index 8eead21..a3502b2 100644
--- a/clang/test/Driver/gcc_forward.c
+++ b/clang/test/Driver/gcc_forward.c
@@ -3,6 +3,7 @@
 // RUN: %clang -target powerpc-unknown-unknown \
 // RUN:   -c %s \
 // RUN:   -Xclang foo-bar \
+// RUN:   -march=x86_64 \
 // RUN:   -mlinker-version=10 -### 2> %t
 // RUN: FileCheck < %t %s
 //
@@ -10,4 +11,8 @@
 // CHECK-NOT: "-mlinker-version=10"
 // CHECK-NOT: "-Xclang"
 // CHECK-NOT: "foo-bar"
+// CHECK: -march
+// CHECK-NOT: "-mlinker-version=10"
+// CHECK-NOT: "-Xclang"
+// CHECK-NOT: "foo-bar"
 // CHECK: gcc_forward