[TVMC] Global pass context for compile and tune #13309
Merged
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Comes as a followup from conversations in #13216. By making the pass context a global value for both
compileandtunecommands, we can ensure the pass context is exactly as the user expected and also test components such asconvert_graph_layoutunder a pass context suitable for testing (e.g. add instruments). With this change, it becomes the users responsibility to ensure the PassContext they select is suitable for the passes that will be run. By default,opt_levelremains as 3 so current workflows that do not alter the pass context from the command line / TVMC Python API should not be affected.