RFR: JDK-8276422 Add command-line option to disable finalization [v4]

[Stuart Marks]

> Pretty much what it says. The new option controls a static member in InstanceKlass that's consulted to determine whether the finalization machinery is activated for instances when a class is loaded. A new native method is added so that this state can be queried from Java. This is used to control whether a finalizer thread is created and to disable the `System` and `Runtime::runFinalization` methods. Includes tests for the above.
> 
> Adding an option to disable finalization is part of [JEP 421](https://openjdk.java.net/jeps/421).

Stuart Marks has updated the pull request incrementally with one additional commit since the last revision:

  Remove Finalizer.Holder class.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6442/files
  - new: https://git.openjdk.java.net/jdk/pull/6442/files/5df8bf9f..e357eeec

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6442&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6442&range=02-03

  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6442.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6442/head:pull/6442

PR: https://git.openjdk.java.net/jdk/pull/6442