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669dc1b628
Fixes #1947. There are two separate issues here: First, the change in comp.rs ensures that we don't round up the amount of storage to the alignment of the bitfield. That generates the "expected" output in #1947 (`__BindgenBitfieldUnit<[u8; 3], u16>`). But that's still not enough to fix that test-case because __BindgenBitfieldUnit would be aligned and have padding, and Rust won't put the extra field in the padding. In order to ensure the bitfield starts at the right alignment, but that Rust can put stuff in the extra field, we need to make a breaking change and split the generated fields in two: One preceding that guarantees alignment, and the actual storage, bit-aligned. This keeps the existing behavior while fixing that test-case.