Changed the handling of variadic intrinsics a bit. Removed the -fp80 option and made real be 80bit floats on X86, this is what the D spec really says it should be and fixes a bunch of issues. Changed the handling of parameter attributes to a bit more generalized approach. Added sext/zext attributes for byte/short/ubyte/ushort parameters, fixes #60 . Parameter attribs now properly set for intrinsic calls if necessary. Made the tango.math.Math patch less intrusive. Fixed/added some mini tests.

interface Inter
{
    int func();
}

extern(C) int printf(char*, ...);

class InterClass : Inter
{
    int func()
    {
        return printf("InterClass.func()\n");
    }
}

alias int delegate() dg_t;

void main()
{
    scope c = new InterClass;

    {
    Inter i = cast(Inter)c;
        {
        dg_t dg = &i.func;
            {
            int j = dg();
            }
        }
    }
}