[ruby/stringio] Update write-barrier at copying
http://ci.rvm.jp/results/trunk-asserts@ruby-sp2-docker/4552803 ``` verify_internal_consistency_reachable_i: WB miss (O->Y) 0x00007f752ddd5550 [3LM ] strio (StringIO)strio -> 0x00007f752d19b7d0 [0 ] T_STRING (String) len: 8, capa: 15 "to_strio" <internal:/tmp/ruby/src/trunk-asserts/lib/rubygems/core_ext/kernel_require.rb>:53: [BUG] gc_verify_internal_consistency: found internal inconsistency. ``` https://github.com/ruby/stringio/commit/2e8ab43cba
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@ -698,15 +698,19 @@ strio_eof(VALUE self)
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static VALUE
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strio_copy(VALUE copy, VALUE orig)
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{
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struct StringIO *ptr;
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struct StringIO *ptr, *old_ptr;
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VALUE old_string = Qundef;
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orig = rb_convert_type(orig, T_DATA, "StringIO", "to_strio");
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if (copy == orig) return copy;
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ptr = StringIO(orig);
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if (check_strio(copy)) {
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strio_free(DATA_PTR(copy));
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old_ptr = check_strio(copy);
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if (old_ptr) {
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old_string = old_ptr->string;
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strio_free(old_ptr);
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}
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DATA_PTR(copy) = ptr;
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RB_OBJ_WRITTEN(copy, old_string, ptr->string);
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RBASIC(copy)->flags &= ~STRIO_READWRITE;
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RBASIC(copy)->flags |= RBASIC(orig)->flags & STRIO_READWRITE;
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++ptr->count;
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