[jdk17u-dev] RFR: 8277385: Zero: Enable CompactStrings support

[Aleksey Shipilev]

Transplanted from https://github.com/openjdk/jdk17u/pull/296.

Additional testing:
 - [x] Linux x86_64 Zero fastdebug build

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Commit messages:
 - Backport 3f847fe89a088d6921107ca887a7a1bace871bd6

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/5/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=5&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277385
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/5.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/5/head:pull/5

PR: https://git.openjdk.java.net/jdk17u-dev/pull/5