vkd3d-shader/hlsl: Move hlsl_ir_function_decl->extern_vars to a local variable.

Approved-by: Francisco Casas (@fcasas)
Approved-by: Elizabeth Figura (@zfigura)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1471

libs/vkd3d-shader/hlsl.c

@@ -2998,7 +2998,6 @@ struct hlsl_ir_function_decl *hlsl_new_func_decl(struct hlsl_ctx *ctx,
     decl->return_type = return_type;
     decl->parameters = *parameters;
     decl->loc = *loc;
-    list_init(&decl->extern_vars);
 
     if (!hlsl_types_are_equal(return_type, ctx->builtin_types.Void))
     {

libs/vkd3d-shader/hlsl.h

@@ -645,12 +645,6 @@ struct hlsl_ir_function_decl
      * executed. Needed to deal with return statements in non-uniform control
      * flow, since some backends can't handle them. */
     struct hlsl_ir_var *early_return_var;
-
-    /* List of all the extern semantic variables; linked by the
-     * hlsl_ir_var.extern_entry fields. This exists as a convenience because
-     * it is often necessary to iterate all extern variables and these can be
-     * declared in as function parameters, or as the function return value. */
-    struct list extern_vars;
 };
 
 struct hlsl_ir_call