Add memory layer to the log file name if it is not "default"
Add memory layer to the log file name if it is not "default"

This is in preparation for night tcmalloc testing.



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@19574 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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