* vm_method.c (rb_class_clear_method_cache): should clear all

  RCLASS_CALLABLE_M_TBLs of all sub-classes (T_ICLASS).

  RCLASS_CALLABLE_M_TBL() caches complemented method entries.
  It should be cleared when the modules are cleared.
  On previous version clears only for direct children.
  It is enough for normal modules because corresponding T_ICLASSes
  are direct children.

  However, refinements create complex data structure. So that
  we need to clear all children (and descendants).
  [ruby-core:71423] [Bug #11672]

* vm_method.c (rb_clear_method_cache_by_class): rb_mKernel
  doesn't call rb_class_clear_method_cache, so that
  clear child T_ICLASSes.

* test/ruby/test_refinement.rb: enable disabled test.




git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52648 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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