Handle field-invocation and method-extraction in the runtime when --lazy_dispatchers=false.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 6cc8e5421676438b17b07fdde16c095f27fbaeca..42122484b09d41c2a75e0b2c65b175cbfbbe6526 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -46,6 +46,7 @@ DECLARE_FLAG(bool, throw_on_javascript_int_overflow);
 DECLARE_FLAG(bool, warn_on_javascript_compatibility);
 DEFINE_FLAG(bool, enable_mirrors, true,
     "Disable to make importing dart:mirrors an error.");
+DECLARE_FLAG(bool, lazy_dispatchers);
 
 // Quick access to the current isolate and zone.
 #define I (isolate())
@@ -1330,6 +1331,8 @@ SequenceNode* Parser::ParseImplicitClosure(const Function& func,
 
 SequenceNode* Parser::ParseMethodExtractor(const Function& func) {
   TRACE_PARSER("ParseMethodExtractor");
+  ASSERT(FLAG_lazy_dispatchers);
+
   ParamList params;
 
   const intptr_t ident_pos = func.token_pos();
@@ -1402,6 +1405,7 @@ void Parser::BuildDispatcherScope(const Function& func,
 SequenceNode* Parser::ParseNoSuchMethodDispatcher(const Function& func,
                                                   Array* default_values) {
   TRACE_PARSER("ParseNoSuchMethodDispatcher");
+  ASSERT(FLAG_lazy_dispatchers);
 
   ASSERT(func.IsNoSuchMethodDispatcher());
   intptr_t token_pos = func.token_pos();
@@ -1459,6 +1463,7 @@ SequenceNode* Parser::ParseNoSuchMethodDispatcher(const Function& func,
 SequenceNode* Parser::ParseInvokeFieldDispatcher(const Function& func,
                                                  Array* default_values) {
   TRACE_PARSER("ParseInvokeFieldDispatcher");
+  ASSERT(FLAG_lazy_dispatchers);
 
   ASSERT(func.IsInvokeFieldDispatcher());
   intptr_t token_pos = func.token_pos();