[clang] [llvm] Add the initializes attribute inference (PR #117104)

[Florian Hahn via llvm-commits]

fhahn wrote:

> Looks like this is causing a crash when building with sanitizers enabled on macOS
> 
> Reduced reproducer: https://llvm.godbolt.org/z/fn83n4oz4
> 
> End-to-end crash on GreenDragon: https://green.lab.llvm.org/job/llvm.org/job/clang-stage2-cmake-RgSan/664/console

Looked like the assertion was straight-forward to fix: 4233a15c9f8e6f77a00a5770a35b70ab8a2705c6

https://github.com/llvm/llvm-project/pull/117104