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

[zibi]

Summary

[Support] Do not run test on z/OS

A part of the unit test CommandLineTest/BadResponseFile, added in
the commit fd3d7a9f8cbb need to be disable for z/OS as it was already done for AIX platform.

[fanbo-meng]

LGTM

llvm/unittests/Support/CommandLineTest.cpp

TEST(CommandLineTest, BadResponseFile) {
   SmallVector<const char *, 2> Argv = {"clang", AFileExp.c_str()};
 
   bool Res = cl::ExpandResponseFiles(Saver, cl::TokenizeGNUCommandLine, Argv);
   ASSERT_TRUE(Res);
   ASSERT_EQ(2U, Argv.size());
   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);
   ASSERT_FALSE(Res);
   ASSERT_EQ(2U, Argv.size());
   ASSERT_STREQ(Argv[0], "clang");
   ASSERT_STREQ(Argv[1], ADirExp.c_str());
 #endif