RFR: 8256181: Remove Allocation of old generation on alternate memory devices functionality [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I get reviews for this change that removes the "Allocation of old generation of Java heap on alternate memory devices" functionality introduced with JDK 12 with [JDK-8202286](https://bugs.openjdk.java.net/browse/JDK-8202286) due to being
> 
> - not used by anyone
> - not maintained by anyone, i.e. several bugs open for a long time and bit rotting
> - requiring some workarounds for new feature development wrt to heap management
> 
> All flags covered by this feature were experimental flags, so there are no additional procedural issues to take.
> 
> I tried to remove all but a few minor cleanups that I thought useful, but of course this is very subjective.
> 
> Testing: hs-tier1-5

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

  ayang review

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1162/files
  - new: https://git.openjdk.java.net/jdk/pull/1162/files/222739bc..9e849b60

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1162&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1162&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1162.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1162/head:pull/1162

PR: https://git.openjdk.java.net/jdk/pull/1162