RFR: 8266017: Refactor the *klass::array_klass_impl code to separate the non-exception-throwing API

[David Holmes]

We currently have array_klass() and array_klass_or_null(), where the former can throw exceptions and the latter can not. But they both delegate to:

array_klass_impl(bool or_null, TRAPS)

which combines both the exception-throwing and non-exception-throwing code into one method declared with TRAPS. To make progress with the change of TRAPS to JavaThread (JDK-8252685) we need to separate these code paths into distinct methods.

Testing: tiers 1-3 (in progress)

Thanks,
David

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Commit messages:
 - 8266017: Refactor the *klass::array_klass_impl code to separate the non-exception-throwing API

Changes: https://git.openjdk.java.net/jdk/pull/3711/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3711&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266017
  Stats: 113 lines in 8 files changed: 69 ins; 21 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3711.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3711/head:pull/3711

PR: https://git.openjdk.java.net/jdk/pull/3711