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
86f4dfe5a8Michael Dusan committed on 1/9/2023, 10:15:42 PM· committed by Andrew Kelleyparentdc18b81
3 files changedLine totals unavailable