nir: rename global/local to private/function memory

the naming is a bit confusing no matter how you look at it. Within SPIR-V
"global" memory is memory accessible from all threads. glsl "global" memory
normally refers to shader thread private memory declared at global scope. As
we already use "shared" for memory shared across all thrads of a work group
the solution where everybody could be happy with is to rename "global" to
"private" and use "global" later for memory usually stored within system
accessible memory (be it VRAM or system RAM if keeping SVM in mind).
glsl "local" memory is memory only accessible within a function, while SPIR-V
"local" memory is memory accessible within the same workgroup.

v2: rename local to function as well
v3: rename vtn_variable_mode_local as well

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/anv_pipeline.c

@@ -185,7 +185,7 @@ anv_shader_compile_to_nir(struct anv_pipeline *pipeline,
     * inline functions.  That way they get properly initialized at the top
     * of the function and not at the top of its caller.
     */
-   NIR_PASS_V(nir, nir_lower_constant_initializers, nir_var_local);
+   NIR_PASS_V(nir, nir_lower_constant_initializers, nir_var_function);
    NIR_PASS_V(nir, nir_lower_returns);
    NIR_PASS_V(nir, nir_inline_functions);
    NIR_PASS_V(nir, nir_opt_deref);
@@ -788,7 +788,7 @@ anv_pipeline_link_fs(const struct brw_compiler *compiler,
           !(stage->key.wm.color_outputs_valid & (1 << rt))) {
          /* Unused or out-of-bounds, throw it away */
          deleted_output = true;
-         var->data.mode = nir_var_local;
+         var->data.mode = nir_var_function;
          exec_node_remove(&var->node);
          exec_list_push_tail(&impl->locals, &var->node);
          continue;