[Bug gdb/16229] New: ebfd_mtime and objfile::mtime are redundant

["tromey at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16229

            Bug ID: 16229
           Summary: ebfd_mtime and objfile::mtime are redundant
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at redhat dot com

ebfd_mtime and objfile::mtime are redundant now that
gdb has a BFD cache.  Also, some uses of these imply that
the BFD cache logic is spread around gdb -- that is, the
cache logic cannot simply be changed, instead all such spots
must be tracked down and changed as well.

One fix would be to add a new gdb_bfd_cached_mtime accessor
and then update the users.  Some spots, like reread_symbols,
could be changed to open a new BFD via the cache and see if
it has changed.

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