Bug 24613 – Bitfield with 64 bits always zero

Values for a bitfield with 64 bits are not stored and remain 0. ``` struct S { ulong a:64; } void main() { S s; s.a = 1; assert(s.a == 1); // Fails: s.a is 0 } ``` This affects both ImportC and normal D with -preview=bitfields.

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