[builtins] Unify Atanh, Cbrt and Expm1 as exports from flibm.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index 2478e3fe5a23b650c40052ac290c08b02280b625..2b19d93e281c9e568278582e9317f33578ae4be4 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -371,6 +371,7 @@ class MachineOperatorBuilder final : public ZoneObject {
   // Floating point trigonometric functions (double-precision).
   const Operator* Float64Atan();
   const Operator* Float64Atan2();
+  const Operator* Float64Atanh();
 
   // Floating point exponential functions.
   const Operator* Float64Exp();
@@ -381,6 +382,9 @@ class MachineOperatorBuilder final : public ZoneObject {
   const Operator* Float64Log2();
   const Operator* Float64Log10();
 
+  const Operator* Float64Cbrt();
+  const Operator* Float64Expm1();
+
   // Floating point bit representation.
   const Operator* Float64ExtractLowWord32();
   const Operator* Float64ExtractHighWord32();