Fixing linux build. (#7580)

Summary:

Fixing build issue in unittest / linux / linux-job

2025-01-09T21:17:15.4021836Z /pytorch/executorch/cmake-out/conv2d_dw_half.glsl:58: error: 'idx_to_ipos_x_wise' : no matching overloaded function found
2025-01-09T21:17:15.4022815Z /pytorch/executorch/cmake-out/conv2d_dw_half.glsl:58: error: 'const' : non-matching or non-convertible constant type for const initializer
2025-01-09T21:17:15.4023491Z 2 errors generated.
2025-01-09T21:17:15.4024083Z /pytorch/executorch/cmake-out/conv2d_dw_output_tile_3x3_half.glsl:70: error: 'idx_to_ipos_x_wise' : no matching overloaded function found
2025-01-09T21:17:15.4025172Z /pytorch/executorch/cmake-out/conv2d_dw_output_tile_3x3_half.glsl:70: error: '=' :  cannot convert from ' const float' to ' temp highp 3-component vector of int'
2025-01-09T21:17:15.4025903Z 2 errors generated.
2025-01-09T21:17:15.4026440Z /pytorch/executorch/cmake-out/conv2d_pw_half.glsl:67: error: 'idx_to_ipos_x_wise' : no matching overloaded function found
2025-01-09T21:17:15.4027412Z /pytorch/executorch/cmake-out/conv2d_pw_half.glsl:67: error: 'const' : non-matching or non-convertible constant type for const initializer

Reviewed By: jorgep31415

Differential Revision: D67997666

Author: trivedivivek

backends/vulkan/runtime/graph/ops/glsl/indexing_utils.h

@@ -223,10 +223,8 @@ ivec3 lpos_to_pos(const ivec3 lpos, const ivec4 axis_map) {
   return pos;
 }
 
-ivec3 idx_to_ipos_x_wise(uint idx, int size_x, int size_y) {
-  const uint div_by_x = idx / size_x;
-  return ivec3(idx % size_x, div_by_x % size_y, div_by_x / size_y);
-}
+#define idx_to_ipos_x_wise(idx, size_x, size_y) \
+  ivec3(idx % size_x, (idx / size_x) % size_y, (idx / size_x) / size_y)
 
 #ifdef USING_BUFFER
 #define load_texel(buf, idx) buf[idx]