i386 string compare - code quality regression from 2.95

[Mark Mitchell]

If Richard approves the patch (as the reigning expert on the x86
back-end), it's OK for the branch, since it is a performance
regression.

It would be nicer, though, if we could understand what is happenning
in a better way, rather than just trying the peephole route.

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Mark Mitchell                   mark@codesourcery.com
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