[Bug tree-optimization/67476] Add --param parloops-schedule=

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67476

--- Comment #3 from vries at gcc dot gnu.org ---
Created attachment 36318
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36318&action=edit
Tentative patch