fix lint errors

Summary:
Changelog: [Internal][Yoga] Fixed lint errors

```arc lint --apply-patches --take CLANGFORMAT --paths-cmd 'hg files xplat/yoga'
```
Added .clang-tidy file

Reviewed By: zertosh

Differential Revision: D19948702

fbshipit-source-id: f77a16d6f2c532267597a84a9caded0aae68c3aa

java/jni/ScopedLocalRef.h

@@ -83,9 +83,7 @@ public:
     return *this;
   }
 
-  ~ScopedLocalRef() {
-    reset();
-  }
+  ~ScopedLocalRef() { reset(); }
 
   /**
    * Deletes the currently held reference and reassigns a new one to the
@@ -119,9 +117,7 @@ public:
   /**
    * Returns true if the underlying JNI reference is not NULL.
    */
-  operator bool() const {
-    return mLocalRef != NULL;
-  }
+  operator bool() const { return mLocalRef != NULL; }
 
   ScopedLocalRef(const ScopedLocalRef& ref) = delete;
   ScopedLocalRef& operator=(const ScopedLocalRef& other) = delete;