Revert "[ReactNative] Fix RCTJavaScriptContext deallocation"

React/Base/RCTBatchedBridge.m

@@ -347,16 +347,15 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
     RCTLatestExecutor = nil;
   }
 
+  void (^mainThreadInvalidate)(void) = ^{
+    RCTAssertMainThread();
+
     [_mainDisplayLink invalidate];
     _mainDisplayLink = nil;
 
     // Invalidate modules
     dispatch_group_t group = dispatch_group_create();
     for (RCTModuleData *moduleData in _modules) {
-    if (moduleData.instance == _javaScriptExecutor) {
-      continue;
-    }
-
       if ([moduleData.instance respondsToSelector:@selector(invalidate)]) {
         [moduleData dispatchBlock:^{
           [(id<RCTInvalidating>)moduleData.instance invalidate];
@@ -365,18 +364,36 @@ RCT_NOT_IMPLEMENTED(-initWithBundleURL:(__unused NSURL *)bundleURL
       moduleData.queue = nil;
     }
     dispatch_group_notify(group, dispatch_get_main_queue(), ^{
-    [_javaScriptExecutor executeBlockOnJavaScriptQueue:^{
-      [_jsDisplayLink invalidate];
-      _jsDisplayLink = nil;
-
-      [_javaScriptExecutor invalidate];
-      _javaScriptExecutor = nil;
-    }];
-
       _modules = nil;
       _modulesByName = nil;
       _frameUpdateObservers = nil;
     });
+  };
+
+  if (!_javaScriptExecutor) {
+
+    // No JS thread running
+    mainThreadInvalidate();
+    return;
+  }
+
+  [_javaScriptExecutor executeBlockOnJavaScriptQueue:^{
+
+    /**
+     * JS Thread deallocations
+     */
+    [_javaScriptExecutor invalidate];
+    _javaScriptExecutor = nil;
+
+    [_jsDisplayLink invalidate];
+    _jsDisplayLink = nil;
+
+    /**
+     * Main Thread deallocations
+     */
+    dispatch_async(dispatch_get_main_queue(), mainThreadInvalidate);
+
+  }];
 }
 
 #pragma mark - RCTBridge methods

React/Executors/RCTContextExecutor.m

@@ -320,7 +320,6 @@ static NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError)
                    onThread:_javaScriptThread
                  withObject:nil
               waitUntilDone:NO];
-  _context = nil;
 }
 
 - (void)dealloc