[lworld+vector] RFR: Merge lworld [v2]

[Jatin Bhateja]

> Merge latest lworld changes into lworld+vector branch.
> 
> All VectorAPI and Valhalla tests are passing at various AVX levels with and w/o -XX:+DeoptimizeALot.
> 
> Best Regards,
> Jatin

Jatin Bhateja has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits:

 - jcheck failure fix
 - Removing a white space
 - Merge branch 'lworld' of http://github.com/openjdk/valhalla into merge_lworld_branch
 - 8319945: [lworld+vector] Fix vector api jtreg crash with "-XX:-EnableVectorSupport"
   
   Reviewed-by: jbhateja
 - 8319972: [lworld+vector] Enable intrinsification of Unsafe.finishPrivateBuffer.
   
   Reviewed-by: xgong
 - 8319971: [lworld+vector] Fallback implementation cleanups.
   
   Reviewed-by: xgong
 - 8311675: [lworld+vector] Max Species support.
   
   Reviewed-by: xgong
 - 8317699: [lworld+vector] Fix Vector API tests crash with "assert(vbox->is_Phi()) failed: should be phi"
   
   Reviewed-by: jbhateja
 - Merge lworld
 - 8314980: [lworld+vector] consider scalarization conditions during ciMultiField creation.
   
   Reviewed-by: xgong
 - ... and 10 more: https://git.openjdk.org/valhalla/compare/df2362fc...d6e58623

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

Changes: https://git.openjdk.org/valhalla/pull/970/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=970&range=01
  Stats: 11700 lines in 149 files changed: 4251 ins; 2688 del; 4761 mod
  Patch: https://git.openjdk.org/valhalla/pull/970.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/970/head:pull/970

PR: https://git.openjdk.org/valhalla/pull/970