[Bug tree-optimization/79878] New: verify_gimple_assign_single: replace error with internal_error

[roland.illig at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79878

            Bug ID: 79878
           Summary: verify_gimple_assign_single: replace error with
                    internal_error
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roland.illig at gmx dot de
  Target Milestone: ---

In tree-cfg.c, the function verify_gimple_assign_single reports several errors
that cannot be triggered by ordinary GCC users. Therefore, these errors should
call internal_error() instead of error().

See bug 79856 and bug 79857.