Special handling around return and liveness (#2234)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Refactor Liveness pass, such that locations can be found independently of setting up ranges.

* Refactor around different stages of liveness span analysis.

* WIP Take into account PHI temporaries in liveness tracking.

* WIP First pass of PHI liveness refactor.

* Add BlockIndex.

* WIP Refactor phi liveness around inst runs.

* More improvements around liveness tracking.

* Bug fixes.
Special handling to not add multiple ends, at starts of blocks and after accesses.

* Fix test output.

* Use IRInsertLoc to track insertion point.

* Liveness markers don't have side effects.

* Fix typo in liveness test.

* Small improvements around setting SuccessorResult.

* Fix memory issue around reallocation and RAIIStackArray.
Update test output.

* Update test output for liveness.slang.

* Fix typo in SuccessorResult blockIndex.

* Small tidy up.

* Handle the root start block, correctly scoping the run.

* Split BlockInfo into 'Root' and 'Function'.
Store successors as BlockIndices.

* Tidy up around liveness tracking.

* Add head/tail support to ArrayViews.
Use Count where appropriate.
Use head/tail in liveness impl.

* Special handling if return is effectively a live variable.

* Update test output for improved return handling.

* Refactor how handling of return accesses.
Fix issue around liveness starts.

* Disable release warning for unused method.

* Some small improvements around liveness pass.

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