tidy: Skip pal and #[test] checks in compiler-builtins

Author: tgross35

src/tools/tidy/src/pal.rs

@@ -36,6 +36,7 @@ use crate::walk::{filter_dirs, walk};
 
 // Paths that may contain platform-specific code.
 const EXCEPTION_PATHS: &[&str] = &[
+    "library/compiler-builtins",
     "library/windows_targets",
     "library/panic_abort",
     "library/panic_unwind",

src/tools/tidy/src/walk.rs

@@ -14,6 +14,7 @@ pub fn filter_dirs(path: &Path) -> bool {
         "compiler/rustc_codegen_gcc",
         "src/llvm-project",
         "library/backtrace",
+        "library/compiler-builtins",
         "library/portable-simd",
         "library/stdarch",
         "src/tools/cargo",