[pull] master from ruby:master#1026
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`io_buffer_or` accessed `buffer->base` and `mask_buffer->base` directly without validating that the buffers were still live. A slice whose parent had been freed retained its stale base pointer, so calling `|` on it caused a UAF. Use `io_buffer_get_bytes_for_reading` for both operands, which raises `IO::Buffer::InvalidatedError` before any memory access if either buffer has been invalidated.
RHash isn't a good fit for storing `cdhash` as this force to allow arbitrary hash types into RHash, which doesn't work with AR tables. It also cause the cdhash to be larger than needed.
Now that they're no longer a RHash instance, we don't have to box the offsets, we can directly srore the raw values, and stop marking them.
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