Incremental changes from background compilation work

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index a93487b3fbb544fb28703169671e3596efab3018..58dcc7e9019ee3021c0286fc9d5428209b95961d 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -60,6 +60,7 @@ DEFINE_FLAG(bool, trace_type_checks, false, "Trace runtime type checks.");
 DECLARE_FLAG(int, deoptimization_counter_threshold);
 DECLARE_FLAG(bool, enable_inlining_annotations);
 DECLARE_FLAG(bool, trace_compiler);
+DECLARE_FLAG(bool, trace_optimizing_compiler);
 DECLARE_FLAG(bool, warn_on_javascript_compatibility);
 DECLARE_FLAG(int, max_polymorphic_checks);
 
@@ -1498,7 +1499,7 @@ DEFINE_RUNTIME_ENTRY(OptimizeInvokedFunction, 1) {
     // Reset usage counter for reoptimization before calling optimizer to
     // prevent recursive triggering of function optimization.
     function.set_usage_counter(0);
-    if (FLAG_trace_compiler) {
+    if (FLAG_trace_compiler || FLAG_trace_optimizing_compiler) {
       if (function.HasOptimizedCode()) {
         THR_Print("ReCompiling function: '%s' \n",
                   function.ToFullyQualifiedCString());