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

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index f2098a90b8361129cf3251d11f5e8a564e55e448..8702d578280e020f5db8757ca74bda67c328c942 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -181,11 +181,14 @@ class SimplifiedOperatorBuilder final : public ZoneObject {
   const Operator* NumberFround();
   const Operator* NumberAtan();
   const Operator* NumberAtan2();
+  const Operator* NumberAtanh();
   const Operator* NumberExp();
+  const Operator* NumberExpm1();
   const Operator* NumberLog();
   const Operator* NumberLog1p();
   const Operator* NumberLog2();
   const Operator* NumberLog10();
+  const Operator* NumberCbrt();
   const Operator* NumberRound();
   const Operator* NumberSqrt();
   const Operator* NumberTrunc();