[llvm] [ObjCARC] Add variations of intrinsics that do not touch reference counts (PR #94919)

[via llvm-commits]

AtariDreams wrote:

> Could you add a test?

I do not know how to test this. I just know that when this function was first written, these intrinsics were not part of LLVM. And there is no reason to believe memcpy will not change retain counts but memcpy_inline will.

https://github.com/llvm/llvm-project/pull/94919