[clang] [CodeGen] Remove the check that allowed non-POD compound literals to be directly evaluated into the destination even when it might alias the source (PR #167344)

[Akira Hatanaka via cfe-commits]

ahatanak wrote:

There's a bug in `QualType::isCXX98PODType` where it returns false for C structs that have ObjC pointer fields when ARC is enabled, which I'm planning to fix later.

https://github.com/llvm/llvm-project/pull/167344