[clang] [clang] make __builtin_object_size and __builtin_dynamic_object_size compatible with GCC's constexpr implementation (PR #196377)

[Timm Baeder via cfe-commits]

tbaederr wrote:

Bytecode interpreter changes are in https://github.com/llvm/llvm-project/pull/196548

https://github.com/llvm/llvm-project/pull/196377