[Bug debug/77471] -O3 -g compile time hog on ppc64le

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77471

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Overhead  Command  Shared Object      Symbol                                    
  34.45%  cc1      cc1                [.] canonicalize_values_star              
  20.56%  cc1      cc1                [.] set_slot_part                         
  12.52%  cc1      cc1                [.] dataflow_set_merge                    
  10.73%  cc1      cc1                [.] loc_cmp                               
   3.03%  cc1      cc1                [.] hash_table<variable_hasher,
xcallocator>::find_slot_with_hash                                               
   1.47%  cc1      libc-2.20.so       [.] free 
...