[Bug fortran/69815] New: Don't always use BLOCKS for front-end optimization variables

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69815

            Bug ID: 69815
           Summary: Don't always use BLOCKS for front-end optimization
                    variables
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tkoenig at gcc dot gnu.org
  Target Milestone: ---

Currently, when the front-end optimization passes creates a temporary variable,
this is put into a BLOCK.

This has led to some ICEs, most of which were resolved by simply not
doing the optimization in question.

However, it would be better to put the variable into the
main namespace if this is possible for such cases, if possible.