Intrinsify System.arraycopy.

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

Change-Id: I15fbbadb450dd21787809759a8b14b21b1e42624
diff --git a/compiler/optimizing/intrinsics_arm.cc b/compiler/optimizing/intrinsics_arm.cc
index 938c78e..2793793 100644
--- a/compiler/optimizing/intrinsics_arm.cc
+++ b/compiler/optimizing/intrinsics_arm.cc
@@ -1333,6 +1333,7 @@
 UNIMPLEMENTED_INTRINSIC(MathRoundFloat)    // Could be done by changing rounding mode, maybe?
 UNIMPLEMENTED_INTRINSIC(UnsafeCASLong)     // High register pressure.
 UNIMPLEMENTED_INTRINSIC(SystemArrayCopyChar)
+UNIMPLEMENTED_INTRINSIC(SystemArrayCopy)
 UNIMPLEMENTED_INTRINSIC(ReferenceGetReferent)
 UNIMPLEMENTED_INTRINSIC(StringGetCharsNoCheck)