sw:vec_iree: Add lit test for the model executions

Use lit infrastructure we can check the expected output of the model, as
well as setting the XFAIL to track the codegen regression.

Run with `lit --path /usr/lib/llvm-11/bin -a sw/vec_iree/samples`
(Add -D RUNNER=qemu to run the qemu tests. Add -D FEATURES=internal to
enable the internal model tests)

See example result in https://bit.googleplex.com/#/hcindyl/6092963308371968

Change-Id: I7b3a94d79d8ca47c5cdb5a4cb115ba54ef795098
18 files changed
tree: 66dc224ec6d81abbda1e65ba7c28c4e22fff3303
  1. build_tools/
  2. cmake/
  3. native_log/
  4. samples/
  5. CMakeLists.txt
  6. springbok_config.h