[11u] RFR 8259886: Improve SSL session cache performance and scalability

[Daniel Jeliński]

Hi,
Please review this 11u backport; this is the same patch as for head,
except for microbenchmark makefile changes that did not apply because
the file doesn't exist in 11u, and the actual microbenchmark, which
would only add weight for no benefit.

Bug: https://bugs.openjdk.java.net/browse/JDK-8259886
webrev: https://djelinski.github.io/8259886-11u/webrev/index.html

Testing: Linux x86_64 tier1 and tier2.

Thanks,
Daniel