[jdk8u-ri] RFR: 8287132: Retire Runtime.runFinalizersOnExit so that it always throws UOE

[David Holmes]

Please review these further changes for JDK 8 Maintenance Release 4 - JSR-337.

The MR4 changes to the reference processing implementation have made continued support for `runFinalizersonExit` unreasonable and so it is "retired" and will always throw `UnsupportedOperationException`. (This is what was also done for `Thread.stop(Throwable)` in JDK 8.)

Various updates to the specifications are made to remove references to running finalizers at exit - see the CSR request for details.

All dead code (including the already dead `JVM_Exit`) is removed. Shutdown.java is replaced by the version from mainline with a slight modification as 8u doesn't have `sun.misc.VM.isShutdown()`.

Tests using RFOE are deleted and a new test to check the throwing of UOE added. The new test was NOT a rename of an existing test but for some reason git is treating it that way.

Testing: :jdk_core group

Thanks,
David

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Commit messages:
 - Fix test
 - add missing bug id
 - 8287132: Retire Runtime.runFinalizersOnExit so that it always throws UOE

Changes: https://git.openjdk.java.net/jdk8u-ri/pull/9/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk8u-ri&pr=9&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287132
  Stats: 573 lines in 25 files changed: 98 ins; 364 del; 111 mod
  Patch: https://git.openjdk.java.net/jdk8u-ri/pull/9.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk8u-ri pull/9/head:pull/9

PR: https://git.openjdk.java.net/jdk8u-ri/pull/9