- Represent strings internally in UTF-16 format, this makes it

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
===================================================================
--- runtime/vm/flow_graph_compiler.cc	(revision 14314)
+++ runtime/vm/flow_graph_compiler.cc	(working copy)
@@ -537,10 +537,8 @@
   GrowableArray<intptr_t> args;
   args.Add(kOneByteStringCid);
   args.Add(kTwoByteStringCid);
-  args.Add(kFourByteStringCid);
   args.Add(kExternalOneByteStringCid);
   args.Add(kExternalTwoByteStringCid);
-  args.Add(kExternalFourByteStringCid);
   CheckClassIds(kClassIdReg, args, is_instance_lbl, is_not_instance_lbl);
 }