Allow optimized code when debugger is active

runtime/vm/flow_graph_compiler.cc

Index: runtime/vm/flow_graph_compiler.cc
===================================================================
--- runtime/vm/flow_graph_compiler.cc	(revision 16810)
+++ runtime/vm/flow_graph_compiler.cc	(working copy)
@@ -184,11 +184,15 @@
 
 bool FlowGraphCompiler::CanOptimize() {
   return !FLAG_report_usage_count &&
-         (FLAG_optimization_counter_threshold >= 0) &&
-         !Isolate::Current()->debugger()->IsActive();
+         (FLAG_optimization_counter_threshold >= 0);
 }
 
 
+bool FlowGraphCompiler::CanOptimizeFunction() const {
+  return CanOptimize() && !parsed_function().function().HasBreakpoint();
+}
+
+
 void FlowGraphCompiler::VisitBlocks() {
   for (intptr_t i = 0; i < block_order().length(); ++i) {
     // Compile the block entry.
@@ -451,7 +455,7 @@
 // Returns 'true' if code generation for this function is complete, i.e.,
 // no fall-through to regular code is needed.
 bool FlowGraphCompiler::TryIntrinsify() {
-  if (!CanOptimize()) return false;
+  if (!CanOptimizeFunction()) return false;
   // Intrinsification skips arguments checks, therefore disable if in checked
   // mode.
   if (FLAG_intrinsify && !FLAG_enable_type_checks) {