RFR: 8303422: Use a common functions to exit the VM for -Xshare:dump and CDS errors [v2]

[Matias Saavedra Silva]

> Currently, we have ad-hoc calls to os::_exit(0), vm_exit_during_initialization() and vm_direct_exit() in cases where there are dumptime or runtime errors for CDS. This patch introduces intuitively named methods for exiting the VM when there are dumptime/runtime errors and when dumping is finished. Verified with tier 1-4 tests.

Matias Saavedra Silva has updated the pull request incrementally with one additional commit since the last revision:

  Coleen and Fred comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13463/files
  - new: https://git.openjdk.org/jdk/pull/13463/files/a533e86e..a2214143

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13463&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13463&range=00-01

  Stats: 3 lines in 2 files changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13463.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13463/head:pull/13463

PR: https://git.openjdk.org/jdk/pull/13463