v8: unbreak freebsd build

Pending review of https://codereview.appspot.com/31500043/

Fixes #6576.

deps/v8/src/platform-freebsd.cc

@@ -182,7 +182,7 @@ void OS::LogSharedLibraryAddresses(Isolate* isolate) {
     // There may be no filename in this line.  Skip to next.
     if (start_of_path == NULL) continue;
     buffer[bytes_read] = 0;
-    LOG(isolate SharedLibraryEvent(start_of_path, start, end));
+    LOG(isolate, SharedLibraryEvent(start_of_path, start, end));
   }
   close(fd);
 }