RFR: 8308764: Reporting errors from create_vm may crash [v5]

[David Holmes]

> There are more details in the bug report but the basic fix is to not delete the main_thread so that it is available to report the exception that caused VM initialization to fail. Added some additional comments too.
> 
> Testing:
>  - basic fault injection to test non-exception exit paths both before and after Universe:;is_fully_initialized() which exercises the failing use of JavaThread::current()
>  -  tiers 1-3 sanity testing
> 
> Thanks.

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Fix comment typo

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14238/files
  - new: https://git.openjdk.org/jdk/pull/14238/files/36e44a4a..884a1a33

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14238&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14238&range=03-04

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14238.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14238/head:pull/14238

PR: https://git.openjdk.org/jdk/pull/14238