Move fused cmp branch ccode to MIR::meta.

This a small refactoring towards removing the large
DecodedInstruction from the MIR class.

Change-Id: I10f9ed5eaac42511d864c71d20a8ff6360292cec
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index b68e699..bbcea10 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -255,6 +255,8 @@
     BasicBlockId* phi_incoming;
     // Establish link between two halves of throwing instructions.
     MIR* throw_insn;
+    // Fused cmp branch condition.
+    ConditionCode ccode;
   } meta;
 };