VM Propagate receiver type from calls to unique selectors in AOT compilation.

runtime/vm/precompiler.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/precompiler.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/branch_optimizer.h"
@@ skipping 1477 matching lines @@
             // Regular function. Enter both getter and non getter name.
             AddNameToFunctionsTable(zone(), &table, fname, function);
             fname = Field::GetterName(fname);
             AddNameToFunctionsTable(zone(), &table, fname, function);
           }
         }
       }
     }
   }
 
-  // Locate all entries with one function only, and whose owner is neither
-  // subclassed nor implemented.
+  // Locate all entries with one function only
   Table::Iterator iter(&table);
   String& key = String::Handle(Z);
   UniqueFunctionsSet functions_set(HashTables::New<UniqueFunctionsSet>(20));
   while (iter.MoveNext()) {
     intptr_t curr_key = iter.Current();
     key ^= table.GetKey(curr_key);
     farray ^= table.GetOrNull(key);
     ASSERT(!farray.IsNull());
     if (farray.Length() == 1) {
       function ^= farray.At(0);
       cls = function.Owner();
-      if (!CHA::IsImplemented(cls) && !CHA::HasSubclasses(cls)) {
-        functions_set.Insert(function);
-      }
+      functions_set.Insert(function);
     }
   }
 
   if (FLAG_print_unique_targets) {
     UniqueFunctionsSet::Iterator unique_iter(&functions_set);
     while (unique_iter.MoveNext()) {
       intptr_t curr_key = unique_iter.Current();
       function ^= functions_set.GetKey(curr_key);
       THR_Print("* %s\n", function.ToQualifiedCString());
     }
@@ skipping 1819 matching lines @@
 
   ASSERT(FLAG_precompiled_mode);
   const bool optimized = function.IsOptimizable();  // False for natives.
   DartPrecompilationPipeline pipeline(zone, field_type_map);
   return PrecompileFunctionHelper(&pipeline, function, optimized);
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart