RFR: 8321479: java -D-D crashes

[Calvin Cheung]

A simple fix just removing an assert.
Also added a jtreg test.

Passed tier1 testing.

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Commit messages:
 - 8321479: java -D-D crashes

Changes: https://git.openjdk.org/jdk/pull/17115/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17115&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/jdk/pull/17115.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17115/head:pull/17115

PR: https://git.openjdk.org/jdk/pull/17115