[llvm] SelectionDAG: Use qNaN constant if FCANONICALIZE not LegalOrCustom (PR #104564)

[Pawan Nirpal via llvm-commits]

pawan-nirpal-031 wrote:

Hi All, I have a patch for implementing fcanonicalize intrinsic for x86 backend, it handles fp80, bf16, f16, f32 and f64 inputs as well as denormals and other subnormals, And I canonicalize variables with mul by 1.0. Are the goals of this PR along the same lines? If yes It may not be required for me to submit another PR. Thanks in advance. 

https://github.com/llvm/llvm-project/pull/104564