Add testcase

Author: BeMg

clang/test/Sema/attr-target-version-unsupported.c

@@ -0,0 +1,4 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown  -fsyntax-only -verify %s
+
+//expected-error@+1 {{target_version attribute is not supported in this target}}
+int __attribute__((target_version("aes"))) foo(void) { return 3; }