Fix debugger wrt concurrent recompilation flag.

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/76293003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17875 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/debug.cc

@@ -2056,7 +2056,7 @@ void Debug::PrepareForBreakPoints() {
   // If preparing for the first break point make sure to deoptimize all
   // functions as debugging does not work with optimized code.
   if (!has_break_points_) {
-    if (FLAG_concurrent_recompilation) {
+    if (isolate_->concurrent_recompilation_enabled()) {
       isolate_->optimizing_compiler_thread()->Flush();
     }