microsoft/spirv_to_dxil: Fix push_constants type declaration

We're not declaring an array of bytes but an array of uint32. Let's
fix the element_count we pass to glsl_array_type().

Fixes: de1e941c59 ("microsoft/spirv_to_dxil: Lower push constant loads to UBO loads")
Reviewed-by: Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16703>

src/microsoft/spirv_to_dxil/spirv_to_dxil.c

@@ -159,9 +159,10 @@ static nir_variable *
 add_push_constant_var(nir_shader *nir, unsigned size, unsigned desc_set, unsigned binding)
 {
    /* Size must be a multiple of 16 as buffer load is loading 16 bytes at a time */
-   size = ALIGN_POT(size, 16) / 16;
+   unsigned num_32bit_words = ALIGN_POT(size, 16) / 4;
 
-   const struct glsl_type *array_type = glsl_array_type(glsl_uint_type(), size, 4);
+   const struct glsl_type *array_type =
+      glsl_array_type(glsl_uint_type(), num_32bit_words, 4);
    const struct glsl_struct_field field = {array_type, "arr"};
    nir_variable *var = nir_variable_create(
       nir, nir_var_mem_ubo,