Method clr

chapter19/src/main/java/com/seaofnodes/simple/RegMask.java:40–40

(int r)

    public RegMaskRW(BitSet bs) { super(bs); }
    public void set(int r) { _bits.set(r); }
    public void clr(int r) { _bits.clear(r); }
    public void set(int r, boolean b) { _bits.set(r,b); }
    public RegMaskRW and( RegMask r ) {
        if( r==null ) return this;