Fix up testcase to:

a) avoid actually compiling anything
b) avoid depositing files in the test directory
c) use a check line to make sure that we're looking for the correct behavior

llvm-svn: 297917

clang/test/Driver/include-default-header.cl

@@ -1,4 +1,6 @@
-// RUN: %clang -v -save-temps -x cl -Xclang -cl-std=CL2.0 -Xclang -finclude-default-header -emit-llvm -c %s
+// RUN: %clang -save-temps -x cl -Xclang -cl-std=CL2.0 -Xclang -finclude-default-header -emit-llvm -S -### %s
+// CHECK-NOT: finclude-default-header
+// Make sure we don't pass -finclude-default-header to any commands other than the driver.
 
 void test() {}