[ET-VK] Using push constants for unary op.

This diff transitions the unary op to utilize push constants, replacing the previous ubo implementation.

Differential Revision: [D77706459](https://our.internmc.facebook.com/intern/diff/D77706459/)

[ghstack-poisoned]

Author: trivedivivek

backends/vulkan/runtime/graph/ops/glsl/unary_op.glsl

@@ -25,12 +25,15 @@ layout(std430) buffer;
 
 ${layout_declare_tensor(0, "w", "t_out", DTYPE, STORAGE)}
 ${layout_declare_tensor(1, "r", "t_in", DTYPE, STORAGE)}
+
+layout(push_constant) uniform restrict Block {
 $if STORAGE == "buffer":
-  ${layout_declare_ubo(2, "int", "numel")}
+  int numel;
 $else:
-  ${layout_declare_ubo(2, "ivec3", "out_limits")}
-${layout_declare_ubo(3, "float", "minimum")}
-${layout_declare_ubo(4, "float", "maximum")}
+  ivec4 out_limits;
+float minimum;
+float maximum;
+};
 
 layout(local_size_x_id = 0, local_size_y_id = 1, local_size_z_id = 2) in;
 
@@ -53,7 +56,7 @@ void main() {
 void main() {
   const ivec3 pos = ivec3(gl_GlobalInvocationID);
 
-  if (any(greaterThanEqual(pos, out_limits))) {
+  if (any(greaterThanEqual(pos, out_limits.xyz))) {
     return;
   }
 

backends/vulkan/runtime/graph/ops/impl/UnaryOp.cpp

@@ -43,15 +43,7 @@ void add_unary_op_node(
   add_dtype_suffix(kernel_name, graph.dtype_of(out));
   add_storage_type_suffix(kernel_name, graph.storage_type_of(out));
 
-  vkapi::ParamsBindList ubos({});
-  if (graph.is_buffer_storage(out)) {
-    ubos.append({graph.numel_ubo(out)});
-  } else {
-    ubos.append({graph.logical_limits_ubo(out)});
-  }
-  ubos.append(
-      {graph.create_params_buffer(min), graph.create_params_buffer(max)});
-
+  const utils::vec2 min_max = {min, max};
   graph.execute_nodes().emplace_back(new DynamicDispatchNode(
       graph,
       VK_KERNEL_FROM_STR(kernel_name),
@@ -60,9 +52,14 @@ void add_unary_op_node(
       // Inputs and Outputs
       {{out, vkapi::kWrite}, {in, vkapi::kRead}},
       // Shader params buffers
-      ubos,
-      // Push Constants
       {},
+      // Push Constants
+      {
+          graph.is_buffer_storage(out) ? graph.numel_pc_of(out)
+                                       : graph.logical_limits_pc_of(out),
+          PushConstantDataInfo(&min_max, sizeof(min_max)),
+      },
+      // pcs,
       // Specialization Constants
       {},
       // Resize Args