Don't pass %s twice to clang -cc1.

The reason this clang invocation was failing is that it had two %s. We would
close stdout after the first one and report a fatal error when trying to
print the second.

llvm-svn: 187122

clang/test/PCH/irgen-rdar13114142.mm

@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 %s -emit-pch -o %t.pch
-// RUN: not %clang_cc1 %s -emit-llvm %s -include-pch %t.pch -o - | FileCheck %s
+// RUN: %clang_cc1 %s -emit-llvm -include-pch %t.pch -o - | FileCheck %s
 
 #ifndef HEADER
 #define HEADER