* config/i386/constraints.md (Y0): Rename register constraint to Yz.
        (Yt): Rename register constraint to Y2.
        * config/i386/sse.md: Use renamed register constraints.
        * config/i386/mmx.md: Ditto.
        * config/i386/i386.md: Ditto.

        * config/i386/i386.md (*dummy_extendsfdf2): Fix operand 1 constraint.

From-SVN: r129622