Sync upstream FreeBSD libm.

Test: treehugger
Change-Id: I583a3e93821d512c975db34fc1610ffd22445d58
diff --git a/libm/upstream-freebsd/lib/msun/src/s_significand.c b/libm/upstream-freebsd/lib/msun/src/s_significand.c
index 356e300..eed80ec 100644
--- a/libm/upstream-freebsd/lib/msun/src/s_significand.c
+++ b/libm/upstream-freebsd/lib/msun/src/s_significand.c
@@ -25,5 +25,5 @@
 double
 significand(double x)
 {
-	return __ieee754_scalb(x,(double) -ilogb(x));
+	return scalb(x,(double) -ilogb(x));
 }