ValueTracking: Generalize known frexp exponent range to any constant (#208316) Extend computeKnownExponentRangeFromContext beyond the special case of a dominating fabs(V) compare against exactly 1.0 to any finite limit. Generalizing below 1.0 exposes a soundness issue: frexp(0) has exponent 0, so a bound derived assuming a nonzero value could wrongly exclude it when the limit implies a negative maximum exponent. Query fcZero and clamp the maximum exponent to at least 0 when the source may be zero. Co-authored-by: Claude (Opus 4.8) <noreply@anthropic.com>
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