Fixed PHP SEGV when constructing messages from a destructor. #8969
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This also fixes the keep_descriptor_pool_after_request option, which was not working properly.
One effect of this PR is to formally forbid users from constructing their own
DescriptorPool
instances. It isn't possible to support this due to the way that our class name mappings rely on global state. This never truly worked previously anyway.Fixes: #8454
I suspect this may also fix #8786