RFR: Merge jdk17

[Jesper Wilhelmsson]

Forwardport JDK 17 -> JDK 18

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Commit messages:
 - Merge
 - 8271350: runtime/Safepoint tests use OutputAnalyzer::shouldMatch instead of shouldContaint
 - 8270866: NPE in DocTreePath.getTreePath()
 - 8270491: SEGV at read_string_field(oopDesc*, char const*, JavaThread*)+0x54
 - 8271223: two runtime/ClassFile tests don't check exit code

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.java.net/jdk/pull/4914/files
  Stats: 205 lines in 14 files changed: 114 ins; 53 del; 38 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4914.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4914/head:pull/4914

PR: https://git.openjdk.java.net/jdk/pull/4914