[lworld] RFR: 8370195: [lworld] Constant-fold _layout_kind loads from constant FlatArrayKlass [v2]

[Quan Anh Mai]

> Hi,
> 
> The load to FlatArrayKlass::_layout_kind can be constant-folded if the receiver is a constant. This eliminates all checks when the array type is known statically or speculated correctly.
> 
> Please leave your reviews, thanks a lot.

Quan Anh Mai has updated the pull request incrementally with two additional commits since the last revision:

 - grammar
 - add comments

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/1687/files
  - new: https://git.openjdk.org/valhalla/pull/1687/files/1c670353..d3fb5867

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1687&range=01
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1687&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1687.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1687/head:pull/1687

PR: https://git.openjdk.org/valhalla/pull/1687