Add -fmodules-ts flag to cc1 for the provisional C++ modules TS, and mark
'module' and 'import' as keywords when the flag is specified.

llvm-svn: 276508
diff --git a/clang/test/Lexer/modules-ts.cpp b/clang/test/Lexer/modules-ts.cpp
new file mode 100644
index 0000000..06be17c
--- /dev/null
+++ b/clang/test/Lexer/modules-ts.cpp
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -fsyntax-only %s
+// RUN: %clang_cc1 -fmodules-ts -DMODULES -fsyntax-only %s
+
+#ifdef MODULES
+#define MODULES_KEYWORD(NAME) _Static_assert(!__is_identifier(NAME), #NAME)
+#else
+#define MODULES_KEYWORD(NAME) _Static_assert(__is_identifier(NAME), #NAME)
+#endif
+
+MODULES_KEYWORD(import);
+MODULES_KEYWORD(module);