8352635: Improve inferencing of Float16 operations with constant inputs

[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

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Issue

• JDK-8352635: Improve inferencing of Float16 operations with constant inputs (Enhancement - P4)

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[jatin-bhateja]

/label add hotspot-compiler-dev

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