[clang] [llvm] [ObjCARC] Delete empty autoreleasepools with no autoreleases in them (PR #144788)

[via llvm-commits]

AZero13 wrote:

Indeed, the old -passes=objc-arc-apelim being replaced with -passes=objc-arc results in the tests passing!

https://github.com/llvm/llvm-project/pull/144788