Add Hide metadata option to LLVM pipeline

[OfekShilon]

Following comments from @jeremy-rifkin and @jryans, this PR is an addition of an option to hide all IR metadata:

Notes:

1. Names were changed from 'filter' to 'hide', seems more natural UI phrasing.
2. This is not a superset of 'hide debug'. llvm-debug intrinsics are unfiltered by the new option - can be filtered by checking both old an new options.
3. This filters also attribute-groups on function definitions, but not individual attributes.
4. There's also a small addition to the 'hide debug' option - hiding rows that include debug-location which typically appear in later stages of the pipeline.
5. Added a test too

[jeremy-rifkin]

Thank you so much for implementing this! Tested locally and looks good to me

[jryans]

Thanks for working on this, looks good to me as well! 😄