[clang] [llvm] [LLVM][Clang] Add and enable strict mode for `getTrailingObjects` (PR #144930)

[Rahul Joshi via llvm-commits]

jurahul wrote:

This is a final step in the `getTrailingObjects` change I started a month ago. All users are now moved to the simplified (non-templated) form in the upstream code. This change will not ensure that any new users also continue to conform to this (i.e., are forced to use the non-templated form when possible).

https://github.com/llvm/llvm-project/pull/144930