RFR: JDK-8326376: java -version failed with CONF=fastdebug -XX:InitialCodeCacheSize=1024K -XX:ReservedCodeCacheSize=1200k

[Thomas Stuefe]

Please review this fix of a regression brought by https://bugs.openjdk.org/browse/JDK-8318444. Thanks to @sunny868 for reporting this.

We bail out during compiler initialization of C2. The thread's ciEnv does not have a CompileTask associated in that case, and that's why we are faulting.

I tested the patch on Linux x64 and confirmed the fix. I also tested with a compiler memory ceiling and the crash option (see https://bugs.openjdk.org/browse/JDK-8318016) and confirmed that the hs-err file contains valid compile ids when we have a valid compile task.

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Commit messages:
 - JDK-8326376-java-version-failed-with-CONF=fastdebug-XX-InitialCodeCacheSize=1024K-XX-ReservedCodeCacheSize=1200k

Changes: https://git.openjdk.org/jdk/pull/17941/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17941&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8326376
  Stats: 7 lines in 2 files changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17941.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17941/head:pull/17941

PR: https://git.openjdk.org/jdk/pull/17941