Nicholas Nethercote 57dbd484b8 Two minor changes:
- When recording errors, VG_(dup_extra_and_update)() previously was only
    called if the 'extra' field was non-NULL.  Now it's always called.
    This is for two reasons:

      a. The 'extra' field could be holding a non-pointer value that just
         happens to be 0
      b. The skin might want to update the error, even if it doesn't use
         the 'extra' field.

    A pretty minor change that shouldn't upset anybody.

  - Made the ExeContext 'where' field of an error visible to skins, by
    adding VG_(get_error_where)().  This can be useful, eg. for comparing
    errors for equality.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1406
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