RFR: 8325763: Revert properties: vm.opt.x.*

[Leo Korinth]

Instead of fixing the problems found in 8320750, remove the feature of mapping -X flags to `vm.opt.x` properties in VMProps.java. After some thought, it seems better to remove the feature than to implement it in a suboptimal way. 

Related to https://github.com/openjdk/jdk/pull/16824.

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Commit messages:
 - 8325763: Revert properties: vm.opt.x.*

Changes: https://git.openjdk.org/jdk/pull/17851/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17851&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325763
  Stats: 40 lines in 6 files changed: 0 ins; 27 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/17851.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17851/head:pull/17851

PR: https://git.openjdk.org/jdk/pull/17851