Avoid using dex cache array pointers in libart.

In preparation for making dex cache arrays native, avoid
using them in Java code.

This causes a performance regression for our reflection
benchmarks. Class_getDeclaredMethod and Class_getMethod
take an up to 30% hit, measured using the Quick compiler.
We accept this hit at this stage and we will tune the
performance after we're done with the larger effort.

Companion libcore/ change:
    https://android-review.googlesource.com/146069

Bug: 20134538
Change-Id: Ibbef3b50043a1311cd40723ed42e1f1c609b8fc1
diff --git a/runtime/mirror/dex_cache-inl.h b/runtime/mirror/dex_cache-inl.h
index 288e88e..6758e22 100644
--- a/runtime/mirror/dex_cache-inl.h
+++ b/runtime/mirror/dex_cache-inl.h
@@ -27,7 +27,7 @@
 namespace mirror {
 
 inline uint32_t DexCache::ClassSize() {
-  uint32_t vtable_entries = Object::kVTableLength + 1;
+  uint32_t vtable_entries = Object::kVTableLength + 5;
   return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 0, 0);
 }