Handle mmap failures for redblack tree cache #9498
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The redblack tree cache is totally optional, so if we can't allocate room for the cache, then just pretend as if the cache is full if mmap fails
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Backports the following patches which fixes critical or major issues: - ruby/ruby#9457 - ruby/ruby#9415 - https://bugs.ruby-lang.org/issues/20184 ruby/ruby#9498 - https://bugs.ruby-lang.org/issues/20085 ruby/ruby#9385
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The redblack tree cache is totally optional, so if we can't allocate room for the cache, then just pretend as if the cache is full if mmap fails