OpenJDK 8u252 Upgrade

[AliveDevil]

Complete changeset: https://github.com/openjdk/jdk8u/compare/jdk8u152-b16..jdk8u252-ga

Noticable changes: // to be filled out

• [ ] Change openjdk/ commit ID
• [ ] Validate local forks for changes.
  • [ ] Check java.io.FileDescriptor for changes. Numerous local changes.
  • [ ] Check sun.misc.VM for changes.
  • [ ] Check sun.nio.ch for changes. Large fork.
  • [ ] Check sun.nio.fs for changes. Large fork.
  • [ ] java.security file may have been altered, fix all the local copies (multiple per arch/image)
  • [ ] Check jdk/make/GenerateClasses.gmk for changes
  • [ ] Check sun.reflect for changes
• [ ] Port SharedSecrets.java

[AliveDevil]

Reason for not going any further than 252: The amount of changes triples after that.

[wasabii]

Closing in favor of 8u725.