Changelog:
===========
- Performance improvements for combining data files, especially when measuring
line coverage. A few different quadratic behaviors were eliminated.
- Performance improvements for generating HTML reports, with a side benefit of
reducing memory use, closing issue 1791. Thanks to Daniel Diniz for helping to
diagnose the problem.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
