Fix bug in optimized byte array views on tranferable backing stores.

runtime/vm/flow_graph_optimizer.cc

Index: runtime/vm/flow_graph_optimizer.cc
===================================================================
--- runtime/vm/flow_graph_optimizer.cc	(revision 20024)
+++ runtime/vm/flow_graph_optimizer.cc	(working copy)
@@ -1502,13 +1502,11 @@
 }
 
 
-static bool IsSupportedByteArrayCid(intptr_t cid) {
+static bool IsSupportedByteArrayViewCid(intptr_t cid) {
   switch (cid) {
     case kInt8ArrayCid:
     case kUint8ArrayCid:
     case kUint8ClampedArrayCid:
-    case kExternalUint8ArrayCid:
-    case kExternalUint8ClampedArrayCid:
     case kInt16ArrayCid:
     case kUint16ArrayCid:
     case kInt32ArrayCid:
@@ -1643,7 +1641,7 @@
     }
   }
 
-  if (IsSupportedByteArrayCid(class_ids[0]) &&
+  if (IsSupportedByteArrayViewCid(class_ids[0]) &&
       (ic_data.NumberOfChecks() == 1)) {
     // For elements that may not fit into a smi on all platforms, check if
     // elements fit into a smi or the platform supports unboxed mints.