RFR: 8304802: After JDK-8297639 the flag G1UsePreventiveGC needs to be added to the obsoletion table [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this change that puts the `G1UsePreventiveGC` into the argument obsoletion table so that the appropriate warning is printed when starting the VM with that option. Functionality has already been removed ~, and CSR request approved~ with [JDK-8297639](https://bugs.openjdk.org/browse/JDK-8297639).
> 
> (Edit: no CSR request required because this was a diagnostic flag)
> 
> Testing: local compilation, manual testing that the obsoletion warning is printed on the command line.
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  dholems review

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13156/files
  - new: https://git.openjdk.org/jdk/pull/13156/files/32410e72..017f2e8c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13156&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13156&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13156.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13156/head:pull/13156

PR: https://git.openjdk.org/jdk/pull/13156