[builtins] Unify Cosh, Sinh and Tanh as exports from flibm

src/base/ieee754.h

Index: src/base/ieee754.h
diff --git a/src/base/ieee754.h b/src/base/ieee754.h
index cf335807321fde77fca98bea21c65e1e94b1d83f..19a6adcc56573a414b937baafaf251715b1011d7 100644
--- a/src/base/ieee754.h
+++ b/src/base/ieee754.h
@@ -50,6 +50,15 @@ double sin(double x);
 // Returns the tangent of |x|, where |x| is given in radians.
 double tan(double x);
 
+// Returns the hyperbolic cosine of |x|, where |x| is given radians.
+double cosh(double x);
+
+// Returns the hyperbolic sine of |x|, where |x| is given radians.
+double sinh(double x);
+
+// Returns the hyperbolic tangent of |x|, where |x| is given radians.
+double tanh(double x);
+
 }  // namespace ieee754
 }  // namespace base
 }  // namespace v8