[lworld] RFR: 8363846: [lworld] Make Class.isIdentityClass() non-native [v6]

[Coleen Phillimore]

> This moves isIdentityClass() implementation to Class.java, and checks within the JVM that is_identity_class() doesn't check the access flags for an ArrayKlass, since AccessFlags aren't initialized in ArrayKlasses.  The AccessFlags should be moved from Klass.hpp to InstanceKlass.cpp in mainline but that's a more complicated change and has several pieces.
> Added a test.
> Tested with tier1 locally.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Fix the test to test both --enable-preview and not.

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/1514/files
  - new: https://git.openjdk.org/valhalla/pull/1514/files/3760602f..50278a63

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1514&range=05
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1514&range=04-05

  Stats: 18 lines in 1 file changed: 8 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/valhalla/pull/1514.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1514/head:pull/1514

PR: https://git.openjdk.org/valhalla/pull/1514