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

src/base/ieee754.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BASE_IEEE754_H_
 #define V8_BASE_IEEE754_H_
 
 namespace v8 {
 namespace base {
 namespace ieee754 {
@@ skipping 32 matching lines @@
 
 // Returns exp(x)-1, the exponential of |x| minus 1.
 double expm1(double x);
 
 // Returns the sine of |x|, where |x| is given in radians.
 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
 
 #endif  // V8_BASE_IEEE754_H_