[llvm] [clang] [mlir] [llvm][TypeSize] Fix addition/subtraction in TypeSize. (PR #72979)

[Paul Walker via cfe-commits]

https://github.com/paulwalker-arm approved this pull request.

It looks like there's a code formatter issue with the MLIR change but otherwise this looks good to me.

https://github.com/llvm/llvm-project/pull/72979