Intrinsify System.arraycopy.

Currently on x64, will do the other architectures in
different changes.

Change-Id: I15fbbadb450dd21787809759a8b14b21b1e42624
diff --git a/compiler/optimizing/intrinsics.cc b/compiler/optimizing/intrinsics.cc
index 9564622..dbe7524 100644
--- a/compiler/optimizing/intrinsics.cc
+++ b/compiler/optimizing/intrinsics.cc
@@ -210,6 +210,9 @@
     case kIntrinsicSystemArrayCopyCharArray:
       return Intrinsics::kSystemArrayCopyChar;
 
+    case kIntrinsicSystemArrayCopy:
+      return Intrinsics::kSystemArrayCopy;
+
     // Thread.currentThread.
     case kIntrinsicCurrentThread:
       return  Intrinsics::kThreadCurrentThread;