[compiler-rt] [compiler-rt] Add big endian support to __aeabi_(idivmod|uidivmod|uldivmod) (PR #126277)

[Simon Tatham via llvm-commits]

statham-arm wrote:

> It doesn't explicitly say "in {r0, r1} _respectively_",

True – perhaps that could be clarified. But it does say that those functions return (via the `__value_in_regs` variant PCS) a value of type `struct { int quot; int rem; }`. That's the part that definitely means the quotient is in the lower-numbered register, because it appears at the start of the struct.

https://github.com/llvm/llvm-project/pull/126277