Don't fail if hasattr fails when rewriting assertions

When rewriting assertions, pytest makes a call to
`__name__` on each object in a comparision. If one of
the objects has reimplemented `__getattr__`, they could
fail trying to fetch `__name__` with an error other than
`AttributeError`, which is what `hasattr` catches.

In this case, the stack trace for the failed `__getattr__`
call will show up in the pytest output, even though
it isn't related to the test failing.

This change fixes that by catching exceptions
that `hasattr` throws.

src/_pytest/assertion/rewrite.py

@@ -525,7 +525,13 @@ def _format_assertmsg(obj):
 
 
 def _should_repr_global_name(obj):
-    return not hasattr(obj, "__name__") and not callable(obj)
+    if callable(obj):
+        return False
+
+    try:
+        return not hasattr(obj, "__name__")
+    except Exception:
+        return True
 
 
 def _format_boolop(explanations, is_or):