[interpreter] new function TInterpreter::SetIncludePath

[ferdymercury]

This Pull request:

Changes or fixes:

Fixes https://its.cern.ch/jira/browse/ROOT-5149

This needs a patch on top of LLVM, so maybe it's better to just close this issue as "won't fix" ?

Checklist:

• tested changes locally
• updated the docs (if necessary)

This PR fixes #

[github-actions]

Test Results

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[dpiparo]

Thanks a lot for this code, impressive. I would like to ask the expert advice of @devajithvs about the need of a clang patch. We are making a lot of effort to remove patches, and adding a patch for this feature might seem perhaps an overkill (the feature would be nice, but it's somewhat far from being a blocker for anybody, I think)

[ferdymercury]

Thanks a lot for this code, impressive. I would like to ask the expert advice of @devajithvs about the need of a clang patch. We are making a lot of effort to remove patches, and adding a patch for this feature might seem perhaps an overkill (the feature would be nice, but it's somewhat far from being a blocker for anybody, I think)

Yep, I completely agree. My vote is for closing the JIRA issue as 'wont-fix' (as well as this PR :) ).

[dpiparo]

After discussing the matter with llvm experts, team members and the author of this PR, we converged on the decision of closing this PR. The changes are quite well done, however in disagreement with the general direction of the project, which is to reduce the number of patches, ideally removing all of them. Once again, thanks for this excellent proposal for code changes.