RFR: 8352635: Improve inferencing of Float16 operations with constant inputs [v4]

[Jatin Bhateja]

> This is a follow-up PR#22755 to improve Float16 operations inferencing.
> 
> The existing scheme to detect Float16 operations for some operations is based on pattern matching which expects to receive inputs through ConvHF2F IR, this patch extends matching to accept constant floating point inputs within the Float16 value range.
> 
> 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 six commits:

 - Merge branch 'master' of http://github.com/openjdk/jdk into JDK-8352635
 - Enabling some test points
 - Adding test points and some re-factoring
 - Merge branch 'master' of https://github.com/openjdk/jdk into JDK-8352635
 - Merge branch 'master' of http://github.com/openjdk/jdk into JDK-8352635
 - 8352635: Improve inferencing of Float16 operations with constant inputs

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Changes: https://git.openjdk.org/jdk/pull/24179/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24179&range=03
  Stats: 336 lines in 5 files changed: 237 ins; 38 del; 61 mod
  Patch: https://git.openjdk.org/jdk/pull/24179.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24179/head:pull/24179

PR: https://git.openjdk.org/jdk/pull/24179