RFR: 8352635: Improve inferencing of Float16 operations with constant inputs [v3]

[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 incrementally with one additional commit since the last revision:

  Enabling some test points

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24179/files
  - new: https://git.openjdk.org/jdk/pull/24179/files/4a7a519b..016f0bc1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24179&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24179&range=01-02

  Stats: 22 lines in 3 files changed: 5 ins; 7 del; 10 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