c/5593: GCC miscompiles bitshifts on unsigned struct members when creating a 64-bit value

[rth@gcc.gnu.org]

Synopsis: GCC miscompiles bitshifts on unsigned struct members when creating a 64-bit value

Responsible-Changed-From-To: unassigned->neil
Responsible-Changed-By: rth
Responsible-Changed-When: Sun Feb 10 19:02:32 2002
Responsible-Changed-Why:
    Pretty sure this is more fodder for your bitfield patch.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5593