Max Graey c4281fd5af
[Support][ValueTraking] Improve KnownFPClass for fadd. Handle infinity signs (#190559)
Improve KnownFPClass reasoning for fadd:

- Refine NaN handling for infinities by checking opposite-sign cases:
   - `-inf` + `+inf` --> `nan`
  - `+inf` + `-inf` --> `nan`
  - `+inf` + `+inf` --> `+inf`
  - `-inf` + `-inf` --> `-inf`
- Introduce `cannotBeOrderedLessEqZero` as pair to
`cannotBeOrderedGreaterEqZero`.
2026-04-06 16:23:20 +02:00
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