RFR: JDK-8309595 Allow javadoc to process unnamed classes [v2]

[Jim Laskey]

> Unnamed classes are rejected by javadoc because they are synthetic.

Jim Laskey has updated the pull request incrementally with one additional commit since the last revision:

  Use checkOutput

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14356/files
  - new: https://git.openjdk.org/jdk/pull/14356/files/405b19e1..29224b33

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14356&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14356&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14356.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14356/head:pull/14356

PR: https://git.openjdk.org/jdk/pull/14356