dmd output executable vs valgrind --tool=massif

[Druzhinin Alexandr]

Massif (and valgrind in general) is a nice tool and using it I tried to 
investigate where memory leaks. I found that more than 50% of heap 
consumed by unknown code. How can I get what those symbols is? May be 
there is some option to hint valgrind where to find symbols or may be I 
should rebuild, for example, druntime with debug info and so on?