[jdk11u-dev] RFR: 8234808: jdb quoted option parsing broken

[luchenlin]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport d1f9b8a8

Changes: https://git.openjdk.org/jdk11u-dev/pull/1962/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1962&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8234808
  Stats: 43 lines in 3 files changed: 28 ins; 4 del; 11 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1962.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1962/head:pull/1962

PR: https://git.openjdk.org/jdk11u-dev/pull/1962