[clang-tidy][NFC] Skip intermediate cache directories when inheriting configs.

[njames93]

Summary

If an configuration specifies InheritParentOption and is cached in child directories, When trying to inherit, it will keep reading the same cache directory file until it reaches the parent directory of where the config was actually stored.
To stop this just set where we are searching from to where the config was actually stored when trying to inherit configs.

clang-tools-extra/clang-tidy/ClangTidyOptions.cpp

if (Result) {
         LLVM_DEBUG(llvm::dbgs()
                    << "Caching configuration for path " << Path << ".\n");
         if (!CachedOptions.count(Path))
           CachedOptions[Path] = *Result;
         Path = llvm::sys::path::parent_path(Path);
       }
       CachedOptions[Path] = *Result;
 
-      CurOptions.push_back(*Result);
-      if (!Result->first.InheritParentConfig.getValueOr(false))
+      CurOptions.push_back(std::move(*Result));
+      if (!CurOptions.back().first.InheritParentConfig.getValueOr(false))
         break;
+      // Set search path to where the file where this config was loaded. If the
+      // Options were sourced from the cache, the actual source may be a parent
+      // directory of this. In which case we will then read a config that is
+      // identical to this on the next loop iteration.
+      // parent_path is used as OptionsSource contains directory and filename.
+      CurrentPath = llvm::sys::path::parent_path(CurOptions.back().second);
     }
   }
   // Reverse order of file configs because closer configs should have higher
   // priority.
   std::reverse(CurOptions.begin() + CurSize, CurOptions.end());
 }
 
 FileOptionsProvider::FileOptionsProvider(