Can't place a member in the remaining space of a bitfield.

[emilio]

I discovered this while investigating #726.

There's one test in our test suite that uncovers this, in bitfield_align.h (Date2). We were not getting the offsets correctly for that struct, so we managed to pack it and the remaining byte was generated correctly.

When implementing proper bitfield padding, that struct starting failing its test.

Input C/C++ Header

struct Test1 {
    unsigned long foo: 45;
    unsigned char byte;
};

Expected Results

Struct should pass tests and have the correct alignment.

Actual Results

We generate an extra byte member, because we can't put it in the last aligned slot in the space that the bitfield would take.