Quick compiler: fix array overrun.

MIRGraph::InlineCalls() was using the MIR opcode to recover
Dalvik instruction flags - something that is only valid for
Dalvik opcodes and not the set of extended MIR opcodes.

This is probably the 3rd or 4th time we've had a bug using
the MIR opcode in situations that are only valid for the Dalvik
opcode subset.  I took the opportunity to scan the code for
other cases of this (didn't find any), and did some cleanup while
I was in the neighborhood.

We should probably rework the DalvikOpcode/MirOpcode model whenver we
get around to removing DalvikInstruction from MIR.

Internal bug b/15352667: out-of-bound access in mir_optimization.cc

Change-Id: I75f06780468880892151e3cdd313e14bfbbaa489
diff --git a/compiler/dex/quick/mir_to_lir.cc b/compiler/dex/quick/mir_to_lir.cc
index 9fc93d0..df56820 100644
--- a/compiler/dex/quick/mir_to_lir.cc
+++ b/compiler/dex/quick/mir_to_lir.cc
@@ -1069,7 +1069,7 @@
       work_half->meta.throw_insn = mir;
     }
 
-    if (opcode >= kMirOpFirst) {
+    if (MIRGraph::IsPseudoMirOp(opcode)) {
       HandleExtendedMethodMIR(bb, mir);
       continue;
     }