Pull an updated version of fbjni into RN OSS

Differential Revision: D3521227

fbshipit-source-id: 57db97ea2af2b2c9e55f380ce05d9e78a5f9d48c

ReactAndroid/src/main/java/com/facebook/jni/ThreadScopeSupport.java

@@ -0,0 +1,22 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+package com.facebook.jni;
+
+import com.facebook.proguard.annotations.DoNotStrip;
+import com.facebook.soloader.SoLoader;
+
+@DoNotStrip
+public class ThreadScopeSupport {
+  static {
+    SoLoader.loadLibrary("fb");
+  }
+
+  // This is just used for ThreadScope::withClassLoader to have a java function
+  // in the stack so that jni has access to the correct classloader.
+  @DoNotStrip
+  private static void runStdFunction(long ptr) {
+    runStdFunctionImpl(ptr);
+  }
+
+  private static native void runStdFunctionImpl(long ptr);
+}