RFR: 8267611: Print more info when pointer_delta assert fails [v2]

[Stefan Karlsson]

> We've seen a few new failures with the new pointer_delta assert. It would be nice if the assert printed the 'left' and 'right' pointer values.

Stefan Karlsson has updated the pull request incrementally with one additional commit since the last revision:

  Review kbarrett

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4163/files
  - new: https://git.openjdk.java.net/jdk/pull/4163/files/b2b3b649..71879fb6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4163&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4163&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4163.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4163/head:pull/4163

PR: https://git.openjdk.java.net/jdk/pull/4163