* gc.c, internal.h: rename ruby_xsizefree/realloc to
  rb_sized_free/realloc.
* array.c: catch up these changes.
* string.c: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43333 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* vm_insnhelper.c (vm_call_method): set ci->me to 0 when the
  original method of a refined method is undef to avoid SEGV.

* vm_method.c (rb_method_entry_without_refinements): return 0 when
  the original method of a refined method is undef to avoid SEGV.

* test/ruby/test_refinement.rb: related test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e