https://github.com/rjmccall commented:

This is generally looking great, and I think it's ready to go as soon as you 
can finish the tests. (You said you weren't able to update all the tests — did 
you have questions about the remaining tests?)

I did have a thought, though.  Are we confident that the in-memory layout that 
LLVM is using for these large integer types matches the layout specified by the 
ABI?  I know this patch makes the overall sizes match, but there's also an 
"endianness" question.  When LLVM stores an i96 on a 32-bit machine, I assume 
it does three 32-bit stores, and those stores probably match the overall 
endianness of the target; for example, on a little-endian architecture, it 
stores the low 32 bits at offset 0, the middle 32 bits at offset 4, and the 
high 32 bits at offset 8.  I just want to make sure that the ABI specification 
for _BitInt actually matches that.

https://github.com/llvm/llvm-project/pull/91364
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