[Bug other/64928] Inordinate cpu time and memory usage in "phase opt and generate" with -ftest-coverage -fprofile-arcs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64928

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note phase opt and generate is a toplevel time area.
The passes which take most of the time are:
 tree DSE                :   2.80 ( 8%) usr   0.00 ( 0%) sys   2.80 ( 8%) wall 
     0 kB ( 0%) ggc
 out of ssa              :   5.90 (16%) usr   0.50 (59%) sys   6.41 (17%) wall 
    26 kB ( 0%) ggc
 CSE                     :   7.53 (21%) usr   0.01 ( 1%) sys   7.53 (20%) wall 
 30934 kB ( 6%) ggc
 reload CSE regs         :   5.74 (16%) usr   0.00 ( 0%) sys   5.73 (16%) wall 
 12325 kB ( 2%) ggc
 scheduling 2            :   1.79 ( 5%) usr   0.01 ( 1%) sys   1.77 ( 5%) wall 
   299 kB ( 0%) ggc