8234841: Enhance buffering of byte buffers

Reviewed-by: alanb, ahgross, rhalade, psandoz

src/java.base/share/classes/java/nio/Direct-X-Buffer.java.template

@@ -213,7 +213,6 @@ class Direct$Type$Buffer$RW$$BO$
     public $Type$Buffer slice() {
         int pos = this.position();
         int lim = this.limit();
-        assert (pos <= lim);
         int rem = (pos <= lim ? lim - pos : 0);
         int off = (pos << $LG_BYTES_PER_VALUE$);
         assert (off >= 0);