[Issue 23573] std.bitmanip.bitfields doesn't respect native endianness

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23573

--- Comment #7 from elpenguino+D at gmail.com ---
I think the problem is that 'least significant bit' is undefined here, since
the term is defined according to the data, not endianness.

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