Sync upstream FreeBSD libm.

Test: treehugger
Change-Id: I583a3e93821d512c975db34fc1610ffd22445d58
diff --git a/libm/upstream-freebsd/lib/msun/src/e_coshf.c b/libm/upstream-freebsd/lib/msun/src/e_coshf.c
index 95a0d6e..1673315 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_coshf.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_coshf.c
@@ -22,7 +22,7 @@
 static const float one = 1.0, half=0.5, huge = 1.0e30;
 
 float
-__ieee754_coshf(float x)
+coshf(float x)
 {
 	float t,w;
 	int32_t ix;
@@ -43,12 +43,12 @@
 
     /* |x| in [0.5*ln2,9], return (exp(|x|)+1/exp(|x|))/2; */
 	if (ix < 0x41100000) {
-		t = __ieee754_expf(fabsf(x));
+		t = expf(fabsf(x));
 		return half*t+half/t;
 	}
 
     /* |x| in [9, log(maxfloat)] return half*exp(|x|) */
-	if (ix < 0x42b17217)  return half*__ieee754_expf(fabsf(x));
+	if (ix < 0x42b17217)  return half*expf(fabsf(x));
 
     /* |x| in [log(maxfloat), overflowthresold] */
 	if (ix<=0x42b2d4fc)