RFR: 8261860: Crash caused by lambda proxy class loaded in Shutdown hook

[Calvin Cheung]

A simple fix to check if the nest host is in the "linked" state before including its lambda proxy classes in the archive during CDS dynamic dump.

Testing: tier1, hs-tiers 2,3,4.

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Commit messages:
 - 8261860: Crash caused by lambda proxy class loaded in Shutdown hook

Changes: https://git.openjdk.java.net/jdk/pull/2634/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2634&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261860
  Stats: 138 lines in 3 files changed: 137 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2634.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2634/head:pull/2634

PR: https://git.openjdk.java.net/jdk/pull/2634