Insert a read barrier in the JNI bridge.

Bug: 20720510
Bug: 12687968
Change-Id: Ia9edb614853bad45ec25d6e2142361a8bda1eccf
diff --git a/runtime/arch/x86/entrypoints_init_x86.cc b/runtime/arch/x86/entrypoints_init_x86.cc
index a371632..737f4d1 100644
--- a/runtime/arch/x86/entrypoints_init_x86.cc
+++ b/runtime/arch/x86/entrypoints_init_x86.cc
@@ -138,6 +138,9 @@
 
   // Deoptimize
   qpoints->pDeoptimize = art_quick_deoptimize_from_compiled_slow_path;
+
+  // Read barrier
+  qpoints->pReadBarrierJni = ReadBarrierJni;
 };
 
 }  // namespace art