null-aware operators in the VM

runtime/vm/parser.h

Index: runtime/vm/parser.h
diff --git a/runtime/vm/parser.h b/runtime/vm/parser.h
index a2492a69ef9d0d65c40d9e301f26dc8e8e244363..ba56ec91cfbf3073e4b94552f48951d325ac65d3 100644
--- a/runtime/vm/parser.h
+++ b/runtime/vm/parser.h
@@ -577,7 +577,9 @@ class Parser : public ValueObject {
   AstNode* LoadReceiver(intptr_t token_pos);
   AstNode* LoadFieldIfUnresolved(AstNode* node);
   AstNode* LoadClosure(PrimaryNode* primary);
-  AstNode* CallGetter(intptr_t token_pos, AstNode* object, const String& name);
+  InstanceGetterNode* CallGetter(intptr_t token_pos,
+                                 AstNode* object,
+                                 const String& name);
 
   AstNode* ParseAssertStatement();
   AstNode* ParseJump(String* label_name);
@@ -708,7 +710,8 @@ class Parser : public ValueObject {
                            intptr_t ident_pos);
   AstNode* ParseInstanceCall(AstNode* receiver,
                              const String& method_name,
-                             intptr_t ident_pos);
+                             intptr_t ident_pos,
+                             bool is_conditional);
   AstNode* ParseClosureCall(AstNode* closure);
   AstNode* GenerateStaticFieldLookup(const Field& field,
                                      intptr_t ident_pos);