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.

module scope5;

int i;

void func(int a, int b)
{
    i = 0;
    {
        scope(exit) i++;
        if (a) {
            scope(exit) i++;
            if (b) return;
            i++;
        }
    }
    i++;
}

void main()
{
    func(0,0);
    assert(i == 2);
    func(1,1);
    assert(i == 2);
    func(1,0);
    assert(i == 4);
}