[pull] master from php:master#819
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Calling __unserialize() on an Openssl\Session that already holds an SSL_SESSION overwrote obj->session without freeing the prior one, leaking an SSL_SESSION (OpenSSL's allocator, bypasses memory_limit). There is no legitimate use for re-running __unserialize() on a live instance, so reject it: throw when obj->session is already populated, before any overwrite. Closes GH-22040
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