Autorelease pool growth fix (#255)

* Place each run loop in its own autorelease pool to keep the memory footprint down

* fix bracket off typo

Author: acoates-ms

React/CxxBridge/RCTMessageThread.mm

@@ -36,7 +36,13 @@
 
 // This is analogous to dispatch_async
 void RCTMessageThread::runAsync(std::function<void()> func) {
-  CFRunLoopPerformBlock(m_cfRunLoop, kCFRunLoopCommonModes, ^{ func(); });
+    // Cherry picked from https://github.com/facebook/react-native/pull/27395/files to fix autorelease pool memory growth
+  CFRunLoopPerformBlock(m_cfRunLoop, kCFRunLoopCommonModes, ^{
+    // Create an autorelease pool each run loop to prevent memory footprint from growing too large, which can lead to performance problems.
+    @autoreleasepool {
+      func();
+    }
+  });
   CFRunLoopWakeUp(m_cfRunLoop);
 }