[jdk11u-dev] RFR: 8209883: ZGC: Compile without C1 broken

[Jie Fu]

Hi all,

Please review the backport of "JDK-8209883 ZGC: Compile without C1 broken", which is suggested here https://github.com/openjdk/jdk11u-dev/pull/921#issuecomment-1073341167 .

Although it doesn't apply cleanly, only a small adjustment is required to do this backport.

Testing:
  - tier1~3 on Linux/x64, no regression.

Thanks.
Best regards,
Jie

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Commit messages:
 - Backport 14443eec10043fa86622d9e8e1d8b4a6bee22482

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/926/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=926&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8209883
  Stats: 7 lines in 2 files changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/926.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/926/head:pull/926

PR: https://git.openjdk.java.net/jdk11u-dev/pull/926