[llvm] [DAG] Lower frem of power-2 using div/trunc/mul+sub (PR #91148)

[Jay Foad via llvm-commits]

jayfoad wrote:

This expansion should also work for negative power-of-two divisors like -4.0.

This expansion should also work for fractional power-of-two divisors like +/ 0.25, unless there is some concern about the division overflowing?

https://github.com/llvm/llvm-project/pull/91148