Update on "[ET-VK] Add support for binary symint ops"

## Changes

* Add an implementation for binary operators which add symbolic integers.

## Motivation

Support executing llama models with dynamic shapes. This operator shows up when exporting with dynamic shapes.

Differential Revision: [D75238029](https://our.internmc.facebook.com/intern/diff/D75238029/)

[ghstack-poisoned]

Author: SS-JIA

backends/vulkan/runtime/VulkanBackend.cpp

@@ -569,7 +569,6 @@ class VulkanBackend final : public ::executorch::runtime::BackendInterface {
 
     if (should_propagate_resize) {
       compute_graph->propagate_resize();
-      compute_graph->encode_execute();
     }
     compute_graph->execute();
 

backends/vulkan/runtime/graph/ComputeGraph.cpp

@@ -712,6 +712,7 @@ void ComputeGraph::propagate_resize() {
   for (std::unique_ptr<ExecuteNode>& node : execute_nodes_) {
     node->trigger_resize(this);
   }
+  encode_execute();
 }
 
 } // namespace vkcompute