[lworld] RFR: 8378000: [lworld] Move ArrayProperties to its own class [v3]

[Joel Sikström]

> Hello,
> 
> We should consider moving the enum ArrayProperties from ArrayKlass to its own class, ArrayProperties. In addition to making the code easier to read and understand, this allows us to have explicit setters/getters, replacing the bit-fiddling expressions that are used in many places. The ArrayProperties-specific methods in ArrayKlass have been moved to be methods in the new ArrayProperties class instead.
> 
> Perhaps the most controversial change in this PR is the removal of `ArrayKlass::ArrayProperties::DEFAULT` in favor of using a default constructor for ArrayProperties. The semantics are still the same, i.e., asking `.is_null_restricted()` or `.is_non_atomic()` will be false for the default constructed property. With this I've also removed the unused fields from ArrayProperties (DUMMY and comments).
> 
> I did consider using define macros to generate enum+getters+setters, but I opted for the stamped-out version instead.
> 
> Testing:
> * Running through tier1-2

Joel Sikström has updated the pull request incrementally with two additional commits since the last revision:

 - Add assert to check for invalid flags/bits
 - Change type to be consistent with compiler type

-------------

Changes:
  - all: https://git.openjdk.org/valhalla/pull/2114/files
  - new: https://git.openjdk.org/valhalla/pull/2114/files/019d164a..266f91a5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=2114&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=2114&range=01-02

  Stats: 9 lines in 1 file changed: 3 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/valhalla/pull/2114.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2114/head:pull/2114

PR: https://git.openjdk.org/valhalla/pull/2114