optimization/6585: useless memory store instructions on x86

[bangerth@dealii.org]

Synopsis: useless memory store instructions on x86

State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Sat Mar 15 04:58:27 2003
State-Changed-Why:
    Bruno, I can verify your problem with 3.2, but I get
    significantly better code with 3.2.2. Can you say a word
    whether the new code satisfies you?
    
    Thanks
      Wolfgang

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6585