[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 #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
# Overhead  Command  Shared Object  Symbol
     4.48%  cc1plus  cc1plus        [.] bitmap_set_bit
     2.34%  cc1plus  cc1plus        [.] bitmap_clear_bit
     1.48%  cc1plus  cc1plus        [.] record_operand_costs
     1.37%  cc1plus  cc1plus        [.] bitmap_bit_p
     1.23%  cc1plus  cc1plus        [.] gt_ggc_mx_lang_tree_node
     1.11%  cc1plus  cc1plus        [.] run_fast_df_dce
     1.09%  cc1plus  cc1plus        [.] df_note_compute
     0.98%  cc1plus  cc1plus        [.] df_insn_refs_collect