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_remainder.c b/libm/upstream-freebsd/lib/msun/src/e_remainder.c
index a4d277f..9be513b 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_remainder.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_remainder.c
@@ -12,7 +12,7 @@
  */
 
 #include <sys/cdefs.h>
-__FBSDID("$FreeBSD: head/lib/msun/src/e_remainder.c 336362 2018-07-17 07:42:14Z bde $");
+__FBSDID("$FreeBSD$");
 
 /* __ieee754_remainder(x,p)
  * Return :                  
@@ -45,11 +45,11 @@
 	hx &= 0x7fffffff;
 
     /* purge off exception values */
-	if(((hp|lp)==0)||		 	/* p = 0 */
-	  (hx>=0x7ff00000)||			/* x not finite */
+	if((hp|lp)==0) return (x*p)/(x*p); 	/* p = 0 */
+	if((hx>=0x7ff00000)||			/* x not finite */
 	  ((hp>=0x7ff00000)&&			/* p is NaN */
 	  (((hp-0x7ff00000)|lp)!=0)))
-	    return nan_mix(x, p)/nan_mix(x, p);
+	    return ((long double)x*p)/((long double)x*p);
 
 
 	if (hp<=0x7fdfffff) x = __ieee754_fmod(x,p+p);	/* now x < 2p */