[clang] [clang] fix half && bfloat16 convert node expr codegen (PR #89051)

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JinjinLi868 wrote:

> > > @JinjinLi868 are you still working on this?
> > 
> > 
> > yes, i am. could you give me some advice and can i help you ?
> 
> Can we have a scalar only patch as @arsenm requested?

ok, you mean, i remove the vector testcase for this patch. and just save the scalar testcase?

https://github.com/llvm/llvm-project/pull/89051