[llvm] [Propeller] Make BBID containing information about MBB's size to detect ir drift (PR #79545)

[via llvm-commits]

lifengxiang1025 wrote:

> There are many alternatives for handling IR drift (e.g., control flow mismatch as done in LLVM IR). So it's probably a better idea to write an RFC on this.

Thanks! I'll do it.

https://github.com/llvm/llvm-project/pull/79545