message: [[noreturn]] on cquery_unreachable_internal
diff: #include <stdio.h>
  #include <stdlib.h>
  -void cquery_unreachable_internal(const char* msg, const char* file, int line) {
  +[[noreturn]] void cquery_unreachable_internal(const char* msg, const char* file, int line) {
  fprintf(stderr, "unreachable %s:%d %s\n", file, line, msg);
  CQUERY_BUILTIN_UNREACHABLE;
  abort();
  