[llvm] [C-API] Preserve backwards compatability for LLVMDIBuilderCreateObjectPointerType (PR #124144)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

Even if it's not technically "stable", messing with the signature of an existing function without changing the name is extremely unfriendly to anything consuming the API through FFI bindings.

https://github.com/llvm/llvm-project/pull/124144