[Support] KnownFPClass: add static helpers for more trig intrinsics (#190609)
Add KnownFPClass::tan, sinh, cosh, tanh, asin, acos, atan, and atan2
static helper methods, following the same pattern as the existing
sin/cos helpers.
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>