[llvm] [ExpandLargeFpConvert] Fix bug in int-to-fp expansion. (PR #85370)

[Nico Weber via llvm-commits]

nico wrote:

Looks like this breaks check-llvm: http://45.33.8.238/linux/133290/step_12.txt

Please take a look and revert for now if it takes a while to fix.

https://github.com/llvm/llvm-project/pull/85370