VM: Fix checked mode crash (issue 13831).

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
===================================================================
--- runtime/vm/flow_graph_compiler_x64.cc	(revision 29679)
+++ runtime/vm/flow_graph_compiler_x64.cc	(working copy)
@@ -24,8 +24,6 @@
 DEFINE_FLAG(bool, trap_on_deoptimization, false, "Trap on deoptimization.");
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(int, reoptimization_counter_threshold);
-DECLARE_FLAG(bool, print_ast);
-DECLARE_FLAG(bool, print_scopes);
 DECLARE_FLAG(bool, enable_type_checks);
 DECLARE_FLAG(bool, eliminate_type_checks);
 
@@ -1201,16 +1199,6 @@
     }
   }
 
-  if (FLAG_print_scopes) {
-    // Print the function scope (again) after generating the prologue in order
-    // to see annotations such as allocation indices of locals.
-    if (FLAG_print_ast) {
-      // Second printing.
-      OS::Print("Annotated ");
-    }
-    AstPrinter::PrintFunctionScope(parsed_function());
-  }
-
   ASSERT(!block_order().is_empty());
   VisitBlocks();