Disable a part of the unit test CommandLineTest/BadResponseFile for z…

…/OS.

[Support] Do not run test on z/OS

A part of the unit test CommandLineTest/BadResponseFile, added in
the commit fd3d7a9 need to be disable for z/OS as it was already done for AIX platform.

Reviewed By: fanbo-meng

Differential Revision: https://reviews.llvm.org/D141084

llvm/unittests/Support/CommandLineTest.cpp

@@ -1060,7 +1060,7 @@ TEST(CommandLineTest, BadResponseFile) {
   ASSERT_STREQ(Argv[0], "clang");
   ASSERT_STREQ(Argv[1], AFileExp.c_str());
 
-#ifndef _AIX
+#if !defined(_AIX) && !defined(__MVS__)
   std::string ADirExp = std::string("@") + std::string(ADir.path());
   Argv = {"clang", ADirExp.c_str()};
   Res = cl::ExpandResponseFiles(Saver, cl::TokenizeGNUCommandLine, Argv);