svga: print warning for unsupported indirect dest reg indexing

For DX9-level shaders, there's only limited support for indirect
indexing of registers (with the loop counter register, not the
general address register.)

Reviewed-by: José Fonseca <jfonseca@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

src/gallium/drivers/svga/svga_tgsi_insn.c

@@ -107,6 +107,10 @@ translate_dst_register( struct svga_shader_emitter *emit,
       break;
    }
 
+   if (reg->Register.Indirect) {
+      debug_warning("Indirect indexing of dest registers is not supported!\n");
+   }
+
    dest.mask = reg->Register.WriteMask;
    assert(dest.mask);