Revert "Remove the link from dalvik instruction back to kMirOpCheck."

This reverts commit 8a3e7e769de02b5b412163cf70da9b9fbaf3b848.

Change-Id: I03a0d6180c350569b39cee2ea194903dbdfca963
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index 4666d1e..bbcea10 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -253,7 +253,7 @@
   union {
     // Incoming edges for phi node.
     BasicBlockId* phi_incoming;
-    // Establish link from check instruction (kMirOpCheck) to the actual throwing instruction.
+    // Establish link between two halves of throwing instructions.
     MIR* throw_insn;
     // Fused cmp branch condition.
     ConditionCode ccode;