Lowerable FloatRemNode

[D.Sturm]

To handle some edge cases for floating point remainder operation (pesky
-0.0) I have to lower FloatRemNodes so I can write some snippets that
handle the special cases.

Is there any problem with removing the final modifier on the class and
making it implement Lowerable? Brings it in line with the Integer versions
of those nodes and seems to be working fine for me.

The changes come down to changing the signature to

public class FloatRemNode extends FloatArithmeticNode implements
Canonicalizable, Lowerable {


and a boilerplate lowerable implementation:

    @Override    public void lower(LoweringTool tool) {
tool.getLowerer().lower(this, tool);    }



-- Daniel