RFR: JDK-8312218: Print additional debug information when hitting assert(in_hash)

[Eric Nothum]

Since it can be hard to reproduce the hitting assert(in_hash), I have added additional debug information that is dumped when hitting the assert. Additional to the previous message, the current graph and the node causing the assertion failure will now be dumped.

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Commit messages:
 - the current graph and node are now being printed if the assert hits

Changes: https://git.openjdk.org/jdk/pull/15022/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15022&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312218
  Stats: 9 lines in 1 file changed: 8 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15022.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15022/head:pull/15022

PR: https://git.openjdk.org/jdk/pull/15022