Android: Decrease cost of reflection

Summary:
This change suppresses access checking during reflection which makes reflection faster by decreasing its overhead.

**Test plan (required)**

My team uses this change in our app.

Adam Comella
Microsoft Corp.
Closes #11204

Differential Revision: D4250790

Pulled By: astreet

fbshipit-source-id: 0ee2f40dcadccc695980fcae14fafe1050acb52f

ReactAndroid/src/main/java/com/facebook/react/bridge/BaseJavaModule.java

@@ -169,6 +169,7 @@ public class JavaMethod implements NativeMethod {
 
     public JavaMethod(Method method) {
       mMethod = method;
+      mMethod.setAccessible(true);
       Class[] parameterTypes = method.getParameterTypes();
       mArgumentExtractors = buildArgumentExtractors(parameterTypes);
       mSignature = buildSignature(parameterTypes);
@@ -354,6 +355,7 @@ public class SyncJavaHook implements SyncNativeHook {
 
     public SyncJavaHook(Method method) {
       mMethod = method;
+      mMethod.setAccessible(true);
       mSignature = buildSignature(method);
     }