Add -tilde for working on the new compiler

src/tilde_backend.cpp

@@ -0,0 +1,18 @@
+#if defined(GB_SYSTEM_WINDOWS)
+	#pragma warning(push)
+	#pragma warning(disable: 4200)
+	#pragma warning(disable: 4201)
+	#define restrict gb_restrict
+#endif
+
+#include "tilde/tb.h"
+
+#if defined(GB_SYSTEM_WINDOWS)
+	#pragma warning(pop)
+#endif
+
+
+bool tb_generate_code(Checker *c) {
+	gb_printf_err("TODO(bill): implement Tilde Backend\n");
+	return false;
+}