[Bug sanitizer/69656] -fsanitize=undefined compile time hog

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69656

--- Comment #12 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Hmm, today's clang takes over 11 minutes to compile the testcase with
-fsanitize=undefined.

The instrumented spots are fewer however:

  28856         callq   __ubsan_handle_type_mismatch
  22770         callq   __ubsan_handle_dynamic_type_cache_miss
     31         callq   __ubsan_handle_load_invalid_value
     11         callq   __ubsan_handle_add_overflow
      5         callq   __ubsan_handle_sub_overflow
      1         callq   __ubsan_handle_nonnull_arg