Merge flush code phase into marking phase.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 7b76e923fab6e087c8150df0a39597c16d9b90c2..01464016be22312625a4eaa42fe91d3656acc9bc 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -773,6 +773,7 @@ bool CompileLazy(Handle<JSFunction> function,
                  ClearExceptionFlag flag) {
   if (function->shared()->is_compiled()) {
     function->set_code(function->shared()->code());
+    function->shared()->set_code_age(0);
     return true;
   } else {
     CompilationInfo info(function, 0, receiver);
@@ -788,6 +789,7 @@ bool CompileLazyInLoop(Handle<JSFunction> function,
                        ClearExceptionFlag flag) {
   if (function->shared()->is_compiled()) {
     function->set_code(function->shared()->code());
+    function->shared()->set_code_age(0);
     return true;
   } else {
     CompilationInfo info(function, 1, receiver);