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

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JinjinLi868 wrote:

> > > The vector tests should still be added
> > 
> > 
> > sorry. if i remove the change of the vector. i have to remove the testcase. because, for the current code convert between vector type of half and bfloat16, it has a bug. And it will be Assert "Invalid cast!""
> 
> OK, LGTM with the else before return fixed. Can you handle the vector case in a follow up?

OK, i will handle the vector case in a follow up.

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