Resynthesize constructor initializers from Kernel.

runtime/vm/kernel_binary_flowgraph.h

 // Copyright (c) 2017, 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.
 
 #ifndef RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_
 #define RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include <map>
@@ skipping 1171 matching lines @@
         if (++next_read_ == field) return;
       }
       case kFunction:
         builder_->SkipFunctionNode();  // read function.
         if (++next_read_ == field) return;
       case kInitializers: {
         intptr_t list_length =
             builder_->ReadListLength();  // read initializers list length.
         for (intptr_t i = 0; i < list_length; i++) {
           Tag tag = builder_->ReadTag();
+          builder_->ReadByte();  // read isSynthetic.
           switch (tag) {
             case kInvalidInitializer:
               continue;
             case kFieldInitializer:
               builder_->SkipCanonicalNameReference();  // read field_reference.
               builder_->SkipExpression();              // read value.
               continue;
             case kSuperInitializer:
               builder_->SkipCanonicalNameReference();  // read target_reference.
               builder_->SkipArguments();               // read arguments.
@@ skipping 328 matching lines @@
  private:
   Reader* reader_;
   intptr_t saved_offset_;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_