Fix pointer conversion error in SetElementPtrSize

SetElementPtrSize used to cast from pointer to uint64_t which
could sign extend with 32 bit dex2oat for 64 bit app image.
Also removed C style casts and added more logging.

Bug: 22858531

(cherry picked from commit d22886357d4c53f74ca298faa7ad2555794e17e0)

Change-Id: I479124328fbc497cfcae20c43b4b55827e446527
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index bb709e8..44cc9b7 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -1533,6 +1533,14 @@
         }
       }
       if (!equal) {
+        VLOG(image) << "Image dex files " << image_dex_file_names.size();
+        for (mirror::String* name : image_dex_file_names) {
+          VLOG(image) << name->ToModifiedUtf8();
+        }
+        VLOG(image) << "Loader dex files " << loader_dex_file_names.size();
+        for (mirror::String* name : loader_dex_file_names) {
+          VLOG(image) << name->ToModifiedUtf8();
+        }
         *error_msg = "Rejecting application image due to class loader mismatch";
         return false;
       }