[test] update tags (compiler-research#117)

`test03_stllike_preinc` fixed by compiler-research/CppInterOp#401
others fixed by compiler-research/CppInterOp#394

Author: Vipul-Cariappa

test/test_doc_features.py

@@ -613,7 +613,7 @@ def pythonizor(klass, name):
         i2 = Integer2(13)
         assert int(i2) == 13
 
-    @mark.xfail
+    @mark.xfail(condition=IS_MAC and not IS_CLANG_REPL, reason="Fails on OSX Cling")
     def test06_add_operator(self):
         """Add operator+"""
 

test/test_operators.py

@@ -232,7 +232,6 @@ def test09_templated_operator(self):
 
         assert (TOIClass() < 1)
 
-    @mark.xfail
     def test10_r_non_associative(self):
         """Use of radd/rmul with non-associative types"""
 
@@ -354,7 +353,6 @@ def test15_class_and_global_mix(self):
         assert std.max_element(x.begin(), x.end())-x.begin() == 2
         assert (x.end() - 3).__deref__() == 1
 
-    @mark.xfail
     def test16_global_ordered_operators(self):
         """Globally defined ordered oeprators"""
 

test/test_stltypes.py

@@ -1413,7 +1413,6 @@ def test02_STL_like_class_iterators(self):
             assert len(b) == 3
             assert sum(b) == 6
 
-    @mark.xfail(condition=not IS_MAC and IS_CLANG_REPL, run=False, reason="Crashes on Ubuntu cling-REPL")
     def test03_stllike_preinc(self):
         """STL-like class with preinc by-ref returns"""