Check module in drcov postprocessing

From zhao...@chromium.org on September 03, 2014 15:20:54

It is possible that drcov runs on different builds of the same module and dump the coverage info, so on post processing, drcov2lcov should check whether the module for symbol info is the same module when drcov information is collected.

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1535