Add a step to upload CBA artifacts

[kevingranade]

Summary

SUMMARY: None

Purpose of change

It's somewhat limiting to just read the default report generated by Clang Build Analysis, so upload the analysis artifacts for later processing.

Describe the solution

Use the upload-artifact action to upload the contents of the analysis directory, which is mostly a pile of json.

Describe alternatives you've considered

Can also reconfigure CBA, but this is more flexible.

Testing

Examine the emitted artifacts.

Additional context

This will allow generation of build flamegraphs with chrome://tracing or http://jamie-wong.com/post/speedscope/

[anothersimulacrum]

Doesn't look like it's uploading the right thing, but it is uploading something now.

[kevingranade]

Yea the problem is I didn't capture the timing files emitted by clang... I think I have it figured out now, I have to pre-create the obj directory because while make will create it, the analysis script will not.
Something else that was confusing me was that the script was finding the obj and timing files, which was happening because it was automatically recursing to look for them. upload-artifacts on the other hand needs to know exactly where the files are.

I think this will emit some of them, but I'll want one more revision if that works to capture the traces for the test files too.