[compiler-rt] [llvm] [polly] [NFC] Fix spelling mistakes in comments 'compatiable' to 'compatible' (PR #185213)

[via llvm-commits]

AndiB wrote:

Is there any way to avoid the formatting issue? 
My first commit didn't show any formatting changes, then it failed the automated test, and I fixed it with clang-format -i 
Any advice on what I did wrong there? 

All tests seem to have passed now.

https://github.com/llvm/llvm-project/pull/185213