Commits on Dec 20, 2020

1. comp: Fix bitfields to allow underaligned fields after them to take p… …

   …adding space.
   
   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.

   

   emilio committed Dec 20, 2020
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