Move cycle checking to much earlier on in the semantic stage

src/main.cpp

@@ -685,6 +685,8 @@ i32 exec_llvm_llc(String output_base) {
 #endif
 }
 
+
+
 int main(int arg_count, char **arg_ptr) {
 	if (arg_count < 2) {
 		usage(make_string_c(arg_ptr[0]));