Sync upstream FreeBSD libm.

Test: treehugger
Change-Id: I583a3e93821d512c975db34fc1610ffd22445d58
diff --git a/libm/upstream-freebsd/lib/msun/src/e_acoshf.c b/libm/upstream-freebsd/lib/msun/src/e_acoshf.c
index f529b20..781ccf2 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_acoshf.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_acoshf.c
@@ -24,7 +24,7 @@
 ln2	= 6.9314718246e-01;  /* 0x3f317218 */
 
 float
-__ieee754_acoshf(float x)
+acoshf(float x)
 {
 	float t;
 	int32_t hx;
@@ -35,14 +35,14 @@
 	    if(hx >=0x7f800000) {	/* x is inf of NaN */
 	        return x+x;
 	    } else
-		return __ieee754_logf(x)+ln2;	/* acosh(huge)=log(2x) */
+		return logf(x)+ln2;	/* acosh(huge)=log(2x) */
 	} else if (hx==0x3f800000) {
 	    return 0.0;			/* acosh(1) = 0 */
 	} else if (hx > 0x40000000) {	/* 2**28 > x > 2 */
 	    t=x*x;
-	    return __ieee754_logf((float)2.0*x-one/(x+__ieee754_sqrtf(t-one)));
+	    return logf((float)2.0*x-one/(x+sqrtf(t-one)));
 	} else {			/* 1<x<2 */
 	    t = x-one;
-	    return log1pf(t+__ieee754_sqrtf((float)2.0*t+t*t));
+	    return log1pf(t+sqrtf((float)2.0*t+t*t));
 	}
 }