Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# ISA-L Testing
+
+Tests are divided into check tests, unit tests and fuzz tests. Check tests,
+built with `make check`, should have no additional dependencies. Other unit
+tests built with `make test` may have additional dependencies in order to make
+comparisons of the output of ISA-L to other standard libraries and ensure
+compatibility. Fuzz tests are meant to be run with a fuzzing tool such as [AFL]
+or [llvm libFuzzer] fuzzing to direct the input data based on coverage. There
+are a number of scripts in the /tools directory to help with automating the
+running of tests.
+
+## Test check
+
+`./tools/test_autorun.sh` is a helper script for kicking off check tests, that
+typically run for a few minutes, or extended tests that could run much
+longer. The command `test_autorun.sh check` build and runs all check tests with
+autotools and runs other short tests to ensure check tests, unit tests,
+examples, install, exe stack, format are correct. Each run of `test_autorun.sh`
+builds tests with a new random test seed that ensures that each run is unique to
+the seed but deterministic for debugging. Tests are also built with sanitizers
+and Electric Fence if available.
+
+## Extended tests
+
+Extended tests are initiated with the command `./tools/test_autorun.sh
+ext`. These build and run check tests, unit tests, and other utilities that can
+take much longer than check tests alone. This includes special compression tools
+and some cross targets such as the no-arch build of base functions only and
+mingw build if tools are available.
+
+## Fuzz testing
+
+`./tools/test_fuzz.sh` is a helper script for fuzzing to setup, build and run
+the ISA-L inflate fuzz tests on multiple fuzz tools. Fuzzing with
+[llvm libFuzzer] requires clang compiler tools with `-fsanitize=fuzzer` or
+`libFuzzer` installed. You can invoke the default fuzz tests under llvm with
+
+    ./tools/test_fuzz.sh -e checked
+
+To use [AFL], install tools and system setup for `afl-fuzz` and run
+
+    ./tools/test_fuzz.sh -e checked --afl 1 --llvm -1 -d 1
+
+This uses internal vectors as a seed. You can also specify a sample file to use
+as a seed instead with `-f <file>`. One of three fuzz tests can be invoked:
+checked, simple, and round_trip.
+
+[llvm libFuzzer]: https://llvm.org/docs/LibFuzzer.html
+[AFL]: https://github.com/google/AFL