Revert "Update to FreeBSD libm r336523."

This reverts commit f86ee10278116d211cfb08679416444e0e714cb5.

Incorrect result for fmodf(3.0f, 0f) = 1.0f breaks ART tests.

Bug: 111710419
Test: art/test/testrunner/testrunner.py -b -t 436-rem-float --target
Change-Id: I7eae68fb92740db33415d16418447bcbbd98ecba
diff --git a/libm/upstream-freebsd/lib/msun/src/e_remainderf.c b/libm/upstream-freebsd/lib/msun/src/e_remainderf.c
index 89cd932..b0014ae 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_remainderf.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_remainderf.c
@@ -14,7 +14,7 @@
  */
 
 #include <sys/cdefs.h>
-__FBSDID("$FreeBSD: head/lib/msun/src/e_remainderf.c 336362 2018-07-17 07:42:14Z bde $");
+__FBSDID("$FreeBSD$");
 
 #include "math.h"
 #include "math_private.h"
@@ -36,10 +36,10 @@
 	hx &= 0x7fffffff;
 
     /* purge off exception values */
-	if((hp==0)||			 	/* p = 0 */
-	  (hx>=0x7f800000)||			/* x not finite */
+	if(hp==0) return (x*p)/(x*p);	 	/* p = 0 */
+	if((hx>=0x7f800000)||			/* x not finite */
 	  ((hp>0x7f800000)))			/* p is NaN */
-	    return nan_mix(x, p)/nan_mix(x, p);
+	    return ((long double)x*p)/((long double)x*p);
 
 
 	if (hp<=0x7effffff) x = __ieee754_fmodf(x,p+p);	/* now x < 2p */