Prepare for kepler #4
Merged
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A couple of fixes for code that I've already added and tested.
Related to #3 that already was reviewed and tested in canary, but doesn't include the logic for inverting the order of symbols in lookup, this was a hacky fix I added when we were trying to align the results of this version with the legacy version we currently use. I think it's best not to include that here as itt might cause confusion or even result in an incorrect symbol being returned.
Related to changes in #1 In this PR I made changes to add methods to obtain the compilation directory. The location had moved and we use it to normalize file paths. However in canary I found these bugs with the code that I added. Both effectively nullptrs.