intel/fs: QUAD_SWIZZLE requires packed data

We could probably support some strides if we tried hard enough but the
whole point of this opcode is to accelerate things with crazy Align16 or
crazy regions.  It's ok if we have to emit an extra MOV to get a packed
source.

Fixes: 8b4a5e641b "intel/fs: Add support for subgroup quad operations"
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7329>

src/intel/compiler/brw_fs_copy_propagation.cpp

@@ -437,6 +437,7 @@ instruction_requires_packed_data(fs_inst *inst)
    case FS_OPCODE_DDX_COARSE:
    case FS_OPCODE_DDY_FINE:
    case FS_OPCODE_DDY_COARSE:
+   case SHADER_OPCODE_QUAD_SWIZZLE:
       return true;
    default:
       return false;