RFR: 8262097: Improve CompilerConfig ergonomics to fix a VM crash after JDK-8261229

[Jie Fu]

Hi all,

This bug was found while I was verifying the fix for JDK-8262096.
It was exposed after JDK-8261229.

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

Thanks.
Best regards,
Jie

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Commit messages:
 - 8262097: Improve CompilerConfig ergonomics to fix a VM crash after JDK-8261229

Changes: https://git.openjdk.java.net/jdk/pull/2668/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2668&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262097
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2668.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2668/head:pull/2668

PR: https://git.openjdk.java.net/jdk/pull/2668