[clang-tools-extra] [clang-tidy] Add portability-avoid-platform-specific-fundamental-types (PR #146970)

[Julian Schmidt via cfe-commits]

https://github.com/5chmidti commented:

Have you looked at google-runtime-int? It should be doing the same thing (maybe small differences)

https://github.com/llvm/llvm-project/pull/146970