revert: sse.md ("sse4_1_blendvpd"): Require "z" class XMM register for operand[3].

revert: sse.md ("sse4_1_blendvpd"): Require "z" class XMM register for operand[3].

Revert:

 2007-06-02  Uros Bizjak  <ubizjak@gmail.com>

       * config/i386/sse.md ("sse4_1_blendvpd"): Require "z" class XMM
       register for operand[3].  Adjust asm template.
       ("sse4_1_blendvpd"): Ditto.
       ("sse4_1_pblendvb"): Ditto.
        * config/i386/i386.c (ix86_expand_sse_4_operands_builtin): Do not
       force operands[3] into xmm0 register for variable blend instructions.

From-SVN: r125285