[jdk11u-dev] RFR: 8231058: VerifyOops crashes with assert(_offset >= 0) failed: offset for non comment?

[SendaoYan]

Hi all,
This is clean backport of [JDK-8231058](https://bugs.openjdk.org/browse/JDK-8231058), to fix JVM crash when running with `-XX:+VerifyOops`. The newly added test run failed before this backport, and run passed after apply this backport.

Additonal testing:

- [ ]  linux aarch64 build with release/slowdebug configure
- [ ]  linux x86_64 build with release/slowdebug configure
- [ ]  jtreg tests(include tier1/2/3 etc.) with release build on linux aarch64
- [ ]  jtreg tests(include tier1/2/3 etc.) with release build on linux x86_64

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Commit messages:
 - 8231058: VerifyOops crashes with assert(_offset >= 0) failed: offset for non comment?

Changes: https://git.openjdk.org/jdk11u-dev/pull/2963/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2963&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8231058
  Stats: 37 lines in 2 files changed: 36 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2963.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2963/head:pull/2963

PR: https://git.openjdk.org/jdk11u-dev/pull/2963