MLBEDSW-2836 Change sets to tuples

Replace conditional checks against sets with tuples.
If not requiring uniqueness, or complex set operations, it is quicker to
use tuples instead.

Signed-off-by: Michael McGeagh <michael.mcgeagh@arm.com>
Change-Id: Ie8732c8d46067244963936c53f0ec81adda50372
diff --git a/ethosu/vela/pass_packing.py b/ethosu/vela/pass_packing.py
index ea2eaa4..9bc04f2 100644
--- a/ethosu/vela/pass_packing.py
+++ b/ethosu/vela/pass_packing.py
@@ -72,7 +72,7 @@
 
 binary_elem_wise_main_ops = Op.op_set(Op.is_binary_elementwise_op)
 
-unary_elem_wise_main_ops = Op.op_set(Op.is_unary_elementwise_op)  # Unary element-wise operations
+unary_elem_wise_main_ops = Op.op_set(Op.is_unary_elementwise_op)
 
 elem_wise_main_ops = binary_elem_wise_main_ops | unary_elem_wise_main_ops