[lworld+vector] RFR: 8314980: [lworld+vector] consider scalarization conditions during ciMultiField creation. [v6]

[Jatin Bhateja]

> Patch adds a new API _ciEnv::is_multifield_scalarized_, to scalarize multifield (ciField[s]) in case target vector cannot accommodate multifield bundle size, else it creates a hierarchical structure ciMultiField and expose entire multifield bundle as one field to C2 compiler.
> 
> This cleans up special handling done in C2 compiler, ci field query APIs and object reconstruction handling  at SafePoint.
> 
> Please review and share your feedback.
> 
> Best Regards,
> Jatin

Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:

  Rebasing ci::is_multifiled_scalarized() to use dynamic compiler type check.

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/918/files
  - new: https://git.openjdk.org/valhalla/pull/918/files/70b39321..bcb1c585

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=918&range=05
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=918&range=04-05

  Stats: 6 lines in 1 file changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/valhalla/pull/918.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/918/head:pull/918

PR: https://git.openjdk.org/valhalla/pull/918