[llvm] [C-API] LLVMOrcCreateObjectLinkingLayerWithInProcessMemoryManager (PR #169862)

[Thomas Munro via llvm-commits]

macdice wrote:

Thanks for looking!

Amended:
* return LLVMErrorRef, use output parameter as suggested
* add PR # to commit message in the style I see in the commit log
* add LLVM_C_ABI to declaration

Also updated https://github.com/macdice/postgres/tree/llvm-22-proposed-c-api to call it.

https://github.com/llvm/llvm-project/pull/169862