Use same checks as compiler-rt which removes checks for readability-* and llvm-header-guard style. The host runtime code does not use the same style for variables/functions/etc. as LLVM nor apparently header guards. The style checks are removed similar to the compiler-rt project.
On some of the patches, the clang-tidy annotations are so verbose they become quite distracting. This should help silent many of the irrelevant ones.