[MSL] Image bindings wrong from GLSL->SPIRV-MSL

Hi, I have below glsl code

`layout (set = 0, binding = 0, r32ui) uniform coherent uimage2D my_image;`

the generated MSL code is:

```
volatile device atomic_uint* my_image_atomic [[id(1)]];
texture2d my_image [[id(1)]];

```

This causes a compilation error note: attribute ‘id’ set location to 1, but minimum is 2, can you help?

Thanks.

Start from the reported GLSL declaration and compare it with the generated MSL declarations for my_image and my_image_atomic. Reproduce the reported compilation error and trace the binding assignment involved; done means the generated declarations use valid, non-conflicting resource IDs and compile successfully.

Written by the indexing model from the issue text.