[Issue 23427] ImportC: some bitfield combinations lead to wrong size struct

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23427

--- Comment #1 from dave287091 at gmail.com ---
Created attachment 1869
  --> https://issues.dlang.org/attachment.cgi?id=1869&action=edit
Failure cases

I generated all of the possible structs with bitfields totaling to 32 bits and
each member having at least 1 bit. All of these assertions pass with clang and
fail with dmd on macOS.

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