RFR: 8314491: Linux: jexec launched via PATH fails to find java [v3]

[Vladimir Petko]

> 8314491: Linux: jexec launched via PATH fails to find java

Vladimir Petko has updated the pull request incrementally with one additional commit since the last revision:

  Review comment: use /proc/self/exe as the backup option

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15343/files
  - new: https://git.openjdk.org/jdk/pull/15343/files/7bd4e677..3f832c40

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15343&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15343&range=01-02

  Stats: 18 lines in 1 file changed: 9 ins; 5 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/15343.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15343/head:pull/15343

PR: https://git.openjdk.org/jdk/pull/15343