RFR: JDK-8312218: Print additional debug information when hitting assert(in_hash) [v2]

[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.

Eric Nothum has updated the pull request incrementally with one additional commit since the last revision:

  adding a line between the graph and node dump

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15022/files
  - new: https://git.openjdk.org/jdk/pull/15022/files/501ca4b9..a90148c4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15022&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15022&range=00-01

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 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