glthread: remove the marshal_fail XML attribute

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4124>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4124>

src/mapi/glapi/gen/gl_API.dtd

@@ -40,7 +40,6 @@
                    exec                NMTOKEN #IMPLIED
                    desktop             (true | false) "true"
                    marshal             NMTOKEN #IMPLIED
-                   marshal_fail        CDATA #IMPLIED>
                    marshal_sync        CDATA #IMPLIED>
                    marshal_count       CDATA #IMPLIED>
                    marshal_call_after  CDATA #IMPLIED>
@@ -133,10 +132,6 @@ param:
         generated but a custom implementation will be present in marshal.c.
         If "draw", it will follow the "async" rules except that "indices" are
         ignored (since they may come from a VBO).
-     marshal_fail - an expression that, if it evaluates true, causes glthread
-        to switch back to the Mesa implementation and call it directly.  Used
-        to disable glthread for GL compatibility interactions that we don't
-        want to track state for.
      marshal_sync - an expression that, if it evaluates true, causes glthread
         to sync and execute the call directly.
      marshal_count - same as count, but variable_param is ignored. Used by

src/mapi/glapi/gen/gl_marshal.py

@@ -261,14 +261,6 @@ class PrintCode(gl_XML.gl_print_base):
 
             self.validate_count_or_fallback(func)
 
-            if func.marshal_fail:
-                out('if ({0}) {{'.format(func.marshal_fail))
-                with indent():
-                    out('_mesa_glthread_disable(ctx, "{0}");'.format(func.name))
-                    self.print_sync_dispatch(func)
-                    out('return;')
-                out('}')
-
             if func.marshal_sync:
                 out('if ({0}) {{'.format(func.marshal_sync))
                 with indent():

src/mapi/glapi/gen/marshal_XML.py

@@ -57,7 +57,6 @@ class marshal_function(gl_XML.gl_function):
 
         # Store the "marshal" attribute, if present.
         self.marshal = element.get('marshal')
-        self.marshal_fail = element.get('marshal_fail')
         self.marshal_sync = element.get('marshal_sync')
         self.marshal_call_after = element.get('marshal_call_after')