gcse related bugfix Re: [bugs] Another ICE

[Richard Kenner]

    Richards: I would really love to invest my time in writing sane
    routines for doing replacements in RTL, since this seems to be deadly
    needed.  Please would be possible for one of you to review the
    simplify_subreg patch, as it is kind of first step in that direction?

I will look at it either later today or early tomorrow.

    Also the gcse dumps are wonderfully useless and completely
    missdirected me while hunting the problem. Can't we create separate
    dump for the gcse itself, the motion passes and the cse, jump run
    afterwards?

I agree this is a good idea.