[pull] master from ruby:master #188
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`toregexp` is fairly similar to `concatstrings`, so this commit extracts a helper for pushing and popping operands on the native stack. There's probably opportunity to move some of this into lir (e.g. Alan suggested a push_many that could use STP on ARM to push 2 at a time), but I might save that for another day.
Both the X509 store and X509 store context were missing write barriers. To the callback object being stored in the ex data. These values were also being stored as an IV, however in Ruby HEAD we're now storing the IVs for T_DATA (generic IVs) on a separate object. So we need an additional write barrier. I believe this was always necessary, because we could have done incremental marking ahead of compaction, and without the write barrier the mark function could have been run before @verify_callback was assigned. This was detected by wbcheck ruby/openssl@1fda3a99ef
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