[Bug tree-optimization/116209] New: range_op_table/operator_table should become a final singleton class

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116209

            Bug ID: 116209
           Summary: range_op_table/operator_table should become a final
                    singleton class
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: internal-improvement
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Noticed while looking into PR 116208. range_op_table's constructor should be
come private and have a static function returns a reference to singleton
version of this.
Also range_op_table should become final since there are no way to more than one
of them around.