tgsi: handle SOA dependencies for MOV/SWZ

SOA dependencies can happen when a register is used both as a source and
destination and the source is swizzled.  For example:

MOV T, T.yxwz; would expand into:

  MOV t0, t1;
  MOV t1, t0;
  MOV t2, t3;
  MOV t3, t2;

The second instruction will produce the wrong result since we wrote to t0
in the first instruction.  We need to use an intermediate temporary to fix
this.

This will take more work to fix for all TGSI instructions.  This seems to
happen with MOV instructions more than anything else so fix that case now
and warn on others.

Fixes piglit glsl-vs-loop test (when not using SSE). See bug 23317.

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