Skip infinities testcases that fail assertions on amd64 only on CURRENT

PR: 205448
MFC after: never
Sponsored by: EMC / Isilon Storage Division

tools/regression/lib/msun/test-fma.c

@@ -492,6 +492,11 @@ main(int argc, char *argv[])
 	}
 
 	for (i = 0; i < nitems(rmodes); i++, j++) {
+#if defined(__amd64__)
+		printf("ok %d # SKIP testcase fails assertion on "
+		    "amd64\n", j);
+		continue;
+#endif
 		printf("rmode = %d\n", rmodes[i]);
 		fesetround(rmodes[i]);
 		test_infinities();