freedreno/ir3: fix for array/reg store vs meta instructions

freedreno/ir3: fix for array/reg store vs meta instructions

fishgl.com has a shader which does roughly:

   foo = texture(...);
   if (bar)
      foo = texture(...);

after lowering phi webs to regs we end up w/ a vec4 reg (array).  But
since it was not an indirect access, we try to skip the extra mov.  This
results that the per-component fanout (split) meta instructions store
directly to the reg (array).  Which doesn't work out in RA.

Signed-off-by: Rob Clark <robdclark@chromium.org>