[jdk21u-dev] RFR: 8321479: java -D-D crashes

[Satyen Subramaniam]

Backporting JDK-8321479: java -D-D crashes. Removes buggy assert statement and adds test. Ran GHA Sanity Checks, local Tier 1 and 2, and new `test/hotspot/jtreg/runtime/CommandLine/UnrecognizedProperty.java` tests. Patch is clean.

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Commit messages:
 - Backport dcdcd48d8fbf076e12841e557ebbe70228c8a92b

Changes: https://git.openjdk.org/jdk21u-dev/pull/1694/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1694&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321479
  Stats: 46 lines in 2 files changed: 45 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1694.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1694/head:pull/1694

PR: https://git.openjdk.org/jdk21u-dev/pull/1694