[llvm] [profgen] Use a 64bit integer for &'ing the loadable address (PR #79930)

[via llvm-commits]

https://github.com/WenleiHe approved this pull request.

Good catch! Thanks for the fix. 

I'm wondering why we didn't run into the same issue when using llvm-profgen to generate profile for server linux kernel. cc @yonghong-song  

https://github.com/llvm/llvm-project/pull/79930