Sync upstream FreeBSD libm.

Test: treehugger
Change-Id: I583a3e93821d512c975db34fc1610ffd22445d58
diff --git a/libm/upstream-freebsd/lib/msun/src/e_lgamma.c b/libm/upstream-freebsd/lib/msun/src/e_lgamma.c
index 43f5175..9c4a30e 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_lgamma.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_lgamma.c
@@ -15,10 +15,10 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-/* __ieee754_lgamma(x)
+/* lgamma(x)
  * Return the logarithm of the Gamma function of x.
  *
- * Method: call __ieee754_lgamma_r
+ * Method: call lgamma_r
  */
 
 #include <float.h>
@@ -29,9 +29,9 @@
 extern int signgam;
 
 double
-__ieee754_lgamma(double x)
+lgamma(double x)
 {
-	return __ieee754_lgamma_r(x,&signgam);
+	return lgamma_r(x,&signgam);
 }
 
 #if (LDBL_MANT_DIG == 53)