feat(const_eval): impl. atanh

Author: ErichDonGubler

CHANGELOG.md

@@ -47,6 +47,7 @@ Bottom level categories:
         - `asin`
         - `asinh`
         - `atan`
+        - `atanh`
         - `cos`
         - `cosh`
         - `round`

naga/src/proc/constant_evaluator.rs

@@ -833,6 +833,9 @@ impl<'a> ConstantEvaluator<'a> {
             crate::MathFunction::Atan => {
                 component_wise_float!(self, span, [arg], |e| { Ok([e.atan()]) })
             }
+            crate::MathFunction::Atanh => {
+                component_wise_float!(self, span, [arg], |e| { Ok([e.atanh()]) })
+            }
             crate::MathFunction::Pow => self.math_pow(arg, arg1.unwrap(), span),
             crate::MathFunction::Clamp => {
                 component_wise_scalar!(