[clang] [clang] Support `__is_trivially_copyable(int()&)==false` (PR #81298)

[via cfe-commits]

fahadnayyar wrote:

@AaronBallman precisely!
`DSC` now is : `DSC_template_arg`
`DSC` in earlier clang was : `DSC_type_specifier`

@AMP999 do you have thoughts about how we can fix this issue?

https://github.com/llvm/llvm-project/pull/81298