Make bridge logger thread-safe and fix noisy in bridge core time

Reviewed By: javache

Differential Revision: D3828301

fbshipit-source-id: 29efdef2fb2c601984c27c4d0a69e1542bbff385

React/Base/RCTBatchedBridge.m

@@ -544,6 +544,8 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithDelegate:(id<RCTBridgeDelegate>)dele
     NSRunLoop *targetRunLoop = [self->_javaScriptExecutor isKindOfClass:[RCTJSCExecutor class]] ? [NSRunLoop currentRunLoop] : [NSRunLoop mainRunLoop];
     [self->_displayLink addToRunLoop:targetRunLoop];
 
+    [self->_performanceLogger markStopForTag:RCTPLBridgeStartup];
+
     // Perform the notification on the main thread, so we can't run into
     // timing issues with RCTRootView
     dispatch_async(dispatch_get_main_queue(), ^{
@@ -571,7 +573,6 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithDelegate:(id<RCTBridgeDelegate>)dele
 - (void)_flushPendingCalls
 {
   RCTAssertJSThread();
-  [_performanceLogger markStopForTag:RCTPLBridgeStartup];
 
   RCT_PROFILE_BEGIN_EVENT(0, @"Processing pendingCalls", @{ @"count": @(_pendingCalls.count) });
   _loading = NO;