llvm dev - Jun 2018 - How to get optimization remarks while testing with lnt in llvm

Hi, I'm new to llvm and am trying to run benchmarks from the test-suite
using lnt to check loop-vectorization for various benchmarks.

Test are compiling and executing fine, but I am not getting optimization
remarks while using flags like -Rpass-missed=loop-vectorize and
-Rpass-analysis=loop-vectorize

I've tried running it like this:

    lnt runtest test-suite --sandbox SANDBOX --cc /usr/local/bin/clang
--test-suite ~/llvm_tests/llvm-test-suite/ --only-test
SingleSource/UnitTests/Vectorizer/ --only-compile --use-lit
~/llvm/utils/lit/lit.py --cflag '-O3' --cflag '-fvectorize'
--cflag
'-Rpass-missed=loop-vectorize' --cflag
'-Rpass-analysis=loop-vectorize' -j
70

This isn't causing any compilation fails, but I haven't been able to get
the optimization remarks (either to terminal or to the logs). I've gone
through all files generated in SANDBOX for the particular test (using grep
to search for the remarks)

Is it possible to get optimization remarks at all? Or is there some other
way to do this?

Any help is appreciated, thank you.
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