[PING] RFR(s): 8176894 Provide specialized implementation for default methods putIfAbsent, computeIfAbsent, computeIfPresent, compute, merge in TreeMap

[Tagir Valeev]

Hello!

A gentle reminder to review the specialized implementation of TreeMap
methods. The latest webrev is here:
http://cr.openjdk.java.net/~tvaleev/webrev/8176894/r4/
Issue:
https://bugs.openjdk.java.net/browse/JDK-8176894

CSR is already approved (thanks to Joe Darcy and Stuart Marks):
https://bugs.openjdk.java.net/browse/JDK-8227666
So only code review is necessary. Also, no sponsorship is necessary.

Here's the previous discussion
http://mail.openjdk.java.net/pipermail/core-libs-dev/2019-October/062859.html
Here's benchmarking results
http://mail.openjdk.java.net/pipermail/core-libs-dev/2020-February/064901.html

Let's push it into Java 15!

With best regards,
Tagir Valeev.