RFR: 8315369: [JVMCI] failure to attach to a libgraal isolate during shutdown should not be fatal [v2]

[Doug Simon]

> This PR moves handling of errors in some JVMCIEnv constructors to the caller. This avoids VM crashes in contexts where errors are recoverable, such as the problem of running out of file descriptors described in the JBS issue for this PR.

Doug Simon has updated the pull request incrementally with one additional commit since the last revision:

  convert assert to guarantee

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15542/files
  - new: https://git.openjdk.org/jdk/pull/15542/files/3634bd6b..66ff8bf2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15542&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15542&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15542.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15542/head:pull/15542

PR: https://git.openjdk.org/jdk/pull/15542