ART: Add Invokes to DecodedInstruction

Add a method Invokes to test for the kInvoke flag.
Also moved IsPseudoMirOp to DecodedInstruction to use it for the various
  querry methods.

Change-Id: I59a2056b7b802b8393fa2b0d977304d252b38c89
Signed-off-by: Jean Christophe Beyler <jean.christophe.beyler@intel.com>
diff --git a/compiler/dex/quick/mir_to_lir.cc b/compiler/dex/quick/mir_to_lir.cc
index caadc0a..07c615f 100644
--- a/compiler/dex/quick/mir_to_lir.cc
+++ b/compiler/dex/quick/mir_to_lir.cc
@@ -1185,7 +1185,7 @@
       work_half->meta.throw_insn = mir;
     }
 
-    if (MIRGraph::IsPseudoMirOp(opcode)) {
+    if (MIR::DecodedInstruction::IsPseudoMirOp(opcode)) {
       HandleExtendedMethodMIR(bb, mir);
       continue;
     }