Don't use in-class initialization of non-static data members. It's a C++11 extension.

runtime/vm/kernel_to_il.h

 // Copyright (c) 2016, 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 VM_KERNEL_TO_IL_H_
 #define VM_KERNEL_TO_IL_H_
 
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
 
@@ skipping 364 matching lines @@
 
 
 struct FunctionScope {
   FunctionNode* function;
   LocalScope* scope;
 };
 
 
 class ScopeBuildingResult : public ZoneAllocated {
  public:
+  ScopeBuildingResult()
+    : this_variable(NULL),
+      type_arguments_variable(NULL),
+      switch_variable(NULL),
+      finally_return_variable(NULL),
+      setter_value(NULL),
+      yield_jump_variable(NULL),
+      yield_context_variable(NULL) {}
+
   Map<VariableDeclaration, LocalVariable*> locals;
   Map<TreeNode, LocalScope*> scopes;
   GrowableArray<FunctionScope> function_scopes;
 
   // Only non-NULL for instance functions.
-  LocalVariable* this_variable = NULL;
+  LocalVariable* this_variable;
 
   // Only non-NULL for factory constructor functions.
-  LocalVariable* type_arguments_variable = NULL;
+  LocalVariable* type_arguments_variable;
 
   // Non-NULL when the function contains a switch statement.
-  LocalVariable* switch_variable = NULL;
+  LocalVariable* switch_variable;
 
   // Non-NULL when the function contains a return inside a finally block.
-  LocalVariable* finally_return_variable = NULL;
+  LocalVariable* finally_return_variable;
 
   // Non-NULL when the function is a setter.
-  LocalVariable* setter_value = NULL;
+  LocalVariable* setter_value;
 
   // Non-NULL if the function contains yield statement.
   // TODO(27590) actual variable is called :await_jump_var, we should rename
   // it to reflect the fact that it is used for both await and yield.
-  LocalVariable* yield_jump_variable = NULL;
+  LocalVariable* yield_jump_variable;
 
   // Non-NULL if the function contains yield statement.
   // TODO(27590) actual variable is called :await_ctx_var, we should rename
   // it to reflect the fact that it is used for both await and yield.
-  LocalVariable* yield_context_variable = NULL;
+  LocalVariable* yield_context_variable;
 
   // Variables used in exception handlers, one per exception handler nesting
   // level.
   GrowableArray<LocalVariable*> exception_variables;
   GrowableArray<LocalVariable*> stack_trace_variables;
   GrowableArray<LocalVariable*> catch_context_variables;
 
   // For-in iterators, one per for-in nesting level.
   GrowableArray<LocalVariable*> iterator_variables;
 };
@@ skipping 398 matching lines @@
   friend class SwitchBlock;
   friend class TryCatchBlock;
   friend class TryFinallyBlock;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 
 #endif  // VM_KERNEL_TO_IL_H_