Bug: http://b/160401633
This is a tool for gathering coverage information from a device and
generating an LLVM coverage report from that information. See top of
the file for usage instructions.
Also redirect acov users to acov-llvm when CLANG_COVERAGE is set.
Test: acov-llvm.py wih clean-device, flush and report subcommands.
Change-Id: I5dba3a669bb6ac2797093903536f346228625c05
