Shilei Tian c253b9f9ca
[AMDGPU] Fix inline constant encoding for v_pk_fmac_f16 (#176659)
This PR handles`v_pk_fmac_f16` inline constant encoding/decoding
differences between pre-GFX11 and GFX11+ hardware.

- Pre-GFX11: fp16 inline constants produce `(f16, 0)` - value in low 16
bits, zero in high.
- GFX11+: fp16 inline constants are duplicated to both halves `(f16,
f16)`.

Fixes #94116.
2026-01-20 19:14:59 -05:00
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