[clang] [analyzer] Handle [[assume(cond)]] as __builtin_assume(cond) (PR #116462)

[Balazs Benics via cfe-commits]

steakhal wrote:

> I've reverted it in https://github.com/llvm/llvm-project/commit/2b9abf0db2d106c7208b4372e662ef5df869e6f1 to clear up some buildbots

Thanks! Ill have a look later.

https://github.com/llvm/llvm-project/pull/116462