Report strings_total_size from DexLoader.cpp
Report strings_total_size from DexLoader.cpp

Summary: Calculates total string size by iterating through all of the strings and summing their size.

Reviewed By: danzimm

Differential Revision: D15724306

fbshipit-source-id: bdb169b28d4afcb3ad94644ab0e85b5a71484a68

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex