Adds support to drcov and drcov2lcov for code in a non-initial module segment, and for gaps between segments.
Changes drcov's output to uses the module segment offset, rather than the module base offset. This better supports modules with code beyond the first segment and with gaps between segments.
Updates drcov2lcov to use a separate bitmap table per segment, rather than per module.
Fixes #2243 (closed)