Subzero: Run cross tests as a much more configurable python script.
The runtests.sh script is removed and replaced with crosstest_generator.py.
"make check" limits to a relevant subset of cross tests to control the combinatorial explosion. We cut the native tests almost in half, and the sandboxed tests down to a quarter.
The --include and --exclude logic is copied/adapted from szbuild.py.
The script works by running through every possible test in the combinatorial explosion, and if the test is a match against the --include and --exclude arguments, the test is built and run.
The script includes lit support, which is the most likely way it will be run. When run with the --lit argument, it sprays the output directory with lit test files in the form of shell scripts, and "make check" runs lit on that directory.
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4085
R=jvoung@chromium.org, mtrofin@chromium.org
Review URL: https://codereview.chromium.org/987503004
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