[Testing] Auto-target parametrization, handle pytest ParameterSet

If the unit test has already been parametrized with pytest.params to
add parameter-specific marks, respect those existing marks.

This can happen in some cases in the CI, uncertain yet what is causing
them.  Maybe pytest-xdist related, but there's some difficulty in
reproducing it locally.

python/tvm/testing.py

@@ -817,19 +817,37 @@ def update_parametrize_target_arg(
     ):
         args = [arg.strip() for arg in argnames.split(",") if arg.strip()]
         if "target" in args:
-            if len(args) == 1:
-                targets = argvalues
-                param_sets = [(target,) for target in targets]
-            else:
-                target_i = args.index("target")
-                targets = [param_set[target_i] for param_set in argvalues]
-                param_sets = argvalues
+            target_i = args.index("target")
+
+            new_argvalues = []
+            for argvalue in argvalues:
+
+                if isinstance(argvalue, _pytest.mark.structures.ParameterSet):
+                    # The parametrized value is already a
+                    # pytest.param, so track any marks already
+                    # defined.
+                    param_set = argvalue.values
+                    target = param_set[target_i]
+                    additional_marks = argvalue.marks
+                elif len(args) == 1:
+                    # Single value parametrization, argvalue is a list of values.
+                    target = argvalue
+                    param_set = (target,)
+                    additional_marks = []
+                else:
+                    # Multiple correlated parameters, argvalue is a list of tuple of values.
+                    param_set = argvalue
+                    target = param_set[target_i]
+                    additional_marks = []
+
+                new_argvalues.append(
+                    pytest.param(
+                        *param_set, marks=_target_to_requirement(target) + additional_marks
+                    )
+                )
 
             try:
-                argvalues[:] = [
-                    pytest.param(*param_set, marks=_target_to_requirement(target))
-                    for target, param_set in zip(targets, param_sets)
-                ]
+                argvalues[:] = new_argvalues
             except TypeError as e:
                 pyfunc = metafunc.definition.function
                 filename = pyfunc.__code__.co_filename