Revert "Drop callertype fixture from benchmark tests"

This reverts commit 72948af since we
need this parametrization for testing the cythonized version of
`_multicall` aka `pluggy.caller.cythonized._c_multicall()`.

testing/benchmark.py

@@ -10,12 +10,12 @@
 hookimpl = HookimplMarker("example")
 
 
-def MC(methods, kwargs, firstresult=False):
+def MC(methods, kwargs, callertype, firstresult=False):
     hookfuncs = []
     for method in methods:
         f = HookImpl(None, "<temp>", method, method.example_impl)
         hookfuncs.append(f)
-    return _multicall(hookfuncs, kwargs, firstresult=firstresult)
+    return callertype(hookfuncs, kwargs, firstresult=firstresult)
 
 
 @hookimpl
@@ -38,9 +38,14 @@ def wrappers(request):
     return [wrapper for i in range(request.param)]
 
 
-def inner_exec(methods):
-    return MC(methods, {"arg1": 1, "arg2": 2, "arg3": 3})
+@pytest.fixture(params=[_multicall], ids=lambda item: item.__name__)
+def callertype(request):
+    return request.param
 
 
-def test_hook_and_wrappers_speed(benchmark, hooks, wrappers):
-    benchmark(inner_exec, hooks + wrappers)
+def inner_exec(methods, callertype):
+    return MC(methods, {"arg1": 1, "arg2": 2, "arg3": 3}, callertype)
+
+
+def test_hook_and_wrappers_speed(benchmark, hooks, wrappers, callertype):
+    benchmark(inner_exec, hooks + wrappers, callertype)