Wire up check JNI force copy mode.

Increase check JNI checks.
Break apart jni_internal.h in to jni_env_ext.h and java_vm_ext.h.
Fix the abuse of ScopedObjectAccess/annotalysis by ScopedCheck in the case
of VM routines.
Make class loader override and shared library class loader JNI global
references rather than mirror pointers.
Clean-ups to native bridge.

Change-Id: If7c6110b5aade7a402bfb67534af86a7b2cdeb55
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index 0fefc21..12c1241 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -138,7 +138,7 @@
  private:
   static void Hook(void* data, const std::string& reason);
 
-  JavaVMExt* vm_;
+  JavaVMExt* const vm_;
   std::string actual_;
 
   DISALLOW_COPY_AND_ASSIGN(CheckJniAbortCatcher);