RFR: 8255068: [JVMCI] errors during compiler creation can be hidden

[Tom Rodriguez]

This improves the handling of errors during compiler creation.  @dougxc @vnkozlov

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Commit messages:
 - 8255068: [JVMCI] errors during compiler creation can be hidden

Changes: https://git.openjdk.java.net/jdk/pull/768/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=768&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255068
  Stats: 25 lines in 1 file changed: 23 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/768.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/768/head:pull/768

PR: https://git.openjdk.java.net/jdk/pull/768