ART: Do not define abstract HIR kinds.

They were never used and the two cases in HSchedulerARM64's
IsSchedulable() were unreachable.

Test: Rely on TreeHugger.
Change-Id: I506bc2a89a6fbf556f32e25ecfe61eaad236a40a
diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index 6029347..5f2833e 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -1697,7 +1697,7 @@
 std::ostream& operator<<(std::ostream& os, const HInstruction::InstructionKind& rhs) {
 #define DECLARE_CASE(type, super) case HInstruction::k##type: os << #type; break;
   switch (rhs) {
-    FOR_EACH_INSTRUCTION(DECLARE_CASE)
+    FOR_EACH_CONCRETE_INSTRUCTION(DECLARE_CASE)
     default:
       os << "Unknown instruction kind " << static_cast<int>(rhs);
       break;