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* Fix bug in eliminate_concat with negative axis

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* Fix unused parameter

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Co-authored-by: Shucai Xiao <shucai.xiao@amd.com>

* Fix bug in eliminate concat: dont use sorted allocations to assign offsets

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Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>

* improve gather implementation to handle negative input indices

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* improve concat to support neg axis input

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* fix cppcheck error

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* code cleanup

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* fix review comments

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* Fix bug in eliminate_concat

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* Skip context_free operators

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* Fix unit test

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