[jdk17u-dev] RFR: 8281275: Upgrading from 8 to 11 no longer accepts '/' as filepath separator in gc paths

[Goetz Lindenmaier]

I backport this for parity with 17.0.4-oracle.

-------------

Commit messages:
 - Backport 84868e39be4522ba87e603beea0f8da9efa43b6d

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/270/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=270&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281275
  Stats: 28 lines in 2 files changed: 23 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/270.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/270/head:pull/270

PR: https://git.openjdk.java.net/jdk17u-dev/pull/270