[NNC] Fix HalfChecker when half present but unused (#48068)
Summary:
Fixes an internally reported issue in the tensorexpr fuser when using FP16 on Cuda. The HalfChecker analysis to determine if we need to define the Half type searches the IR for expressions that use Half. If one of the parameters is of type Half but it (or any other Half expr) are not used in the IR we'll return a false negative. Fix this by adding the parameter list to the HalfChecker.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48068
Reviewed By: ZolotukhinM
Differential Revision: D25009680
Pulled By: nickgg
fbshipit-source-id: 24fddef06821f130db3d3f45d6d041c7f34a6ab0
