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

[Thomas Munro via llvm-commits]

macdice wrote:

Let me lay out the motivation, so I can hopefully be corrected if I've misunderstood something:

* we want to use JITLink in order to
  * drop our backported SectionMemoryManager that got us out of a nasty bind on AAarch64, taken from https://github.com/llvm/llvm-project/pull/71968
  * run on newer platforms as discussed in https://github.com/llvm/llvm-project/issues/106203
* LLJIT still uses RuntimeDyld by default as of main today, per LLJIT.h's documentation of setObjectLinkingLayerCreator
* the default object linking layer will eventually change to JITLink, so one reason to need our own creator function will go away
* we'll still need a way to enable debugging and profiling support, so unless there's another way to inject the plugins we'll still need to control construction

Does this all make sense?  Thanks!

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