[clang] [llvm] [Clang]: Enable speculative devirtualization (PR #159685)

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

Hi @shafik 
Thanks so much for giving attention to the patch.
I have added a description and it's ready now for review.

https://github.com/llvm/llvm-project/pull/159685