llvm codegen: fix f16,f32,f64 nan bitcasts

@bitCast from integer NaN representation to float NaN resulted in
changed bits in float. This only happened with signaled NaN.

- added test for signaled NaN
- added tests for quiet NaN (for completeness)

closes #14198
e0fb4c29cbMichael Dusan committed on 1/5/2023, 9:22:30 AM· committed by Andrew Kelleyparentb89158d
3 files changedLine totals unavailable