feat(const_eval): impl. atanh

Author: ErichDonGubler

naga/src/proc/constant_evaluator.rs

@@ -795,6 +795,9 @@ impl<'a> ConstantEvaluator<'a> {
             crate::MathFunction::Atan => {
                 component_wise_float!(self, span, [arg], |e| { e.atan().into() })
             }
+            crate::MathFunction::Atanh => {
+                component_wise_float!(self, span, [arg], |e| { e.atanh().into() })
+            }
             crate::MathFunction::Pow => self.math_pow(arg, arg1.unwrap(), span),
             crate::MathFunction::Clamp => {
                 component_wise_scalar!(