gas/ChangeLog:

gas/ChangeLog:
* read.c (s_weakref): Do not permit redefinitions.
* symbols.c (colon): Do not permit redefinitions of equated
symbols.
gas/testsuite/ChangeLog:
* gas/all/gas.exp: Remove weakref xfail.  Run weakref4.s.
* gas/all/weakref1.s: Move redefinition bits to...
* gas/all/weakref4.s: ... new file.
* gas/all/weakref1.d: Remove command moved to weakref1u.  Adjust
remaining command for leading tabs.  Regenerate.
* gas/all/weakref1l.d: Regenerate.
* gas/all/weakref1u.d: Likewise.
* gas/all/wealref1w.d: Likewise.