tgsi: check for SOA dependencies in SSE and PPC code generators

Fall back to interpreter for now.  This doesn't happen very often.

src/gallium/auxiliary/tgsi/tgsi_ppc.c

@@ -1112,6 +1112,10 @@ emit_instruction(struct gen_context *gen,
    if (inst->Instruction.Saturate != TGSI_SAT_NONE)
       return 0;
 
+   /* need to use extra temps to fix SOA dependencies : */
+   if (tgsi_check_soa_dependencies(inst))
+      return FALSE;
+
    switch (inst->Instruction.Opcode) {
    case TGSI_OPCODE_MOV:
    case TGSI_OPCODE_SWZ:

src/gallium/auxiliary/tgsi/tgsi_sse2.c

@@ -1506,6 +1506,10 @@ emit_instruction(
    if (inst->Instruction.Saturate != TGSI_SAT_NONE)
       return FALSE;
 
+   /* need to use extra temps to fix SOA dependencies : */
+   if (tgsi_check_soa_dependencies(inst))
+      return FALSE;
+
    switch (inst->Instruction.Opcode) {
    case TGSI_OPCODE_ARL:
       FOR_EACH_DST0_ENABLED_CHANNEL( *inst, chan_index ) {