[Bug compile/17938] New: Calling clear_symtab_users is indeed too costly

["dje at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17938

            Bug ID: 17938
           Summary: Calling clear_symtab_users is indeed too costly
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: compile
          Assignee: unassigned at sourceware dot org
          Reporter: dje at google dot com

compile-object-run.c has this:

        /* It may be a bit too pervasive in this dummy_frame dtor callback.  */
        clear_symtab_users (0);

This is indeed too pervasive (costly).

Python scripts will get a clear_objfiles event which an trigger large scale
flushing of cached data.  Plus it will flush the symbol lookup cache.

Earlier the function does this:

        free_objfile (objfile);

What we need on the python side is an objfile_freed event.

Are there other reasons why clear_symtab_users is called here?
I see that free_objfile does some of the things that clear_symtab_users does.

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