[TIR][Bugfix] Correct handling of buffer argument when scheduling #12816
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Follow-up from #11269, which allowed schedule arguments of the buffer to be transformed to be specified as a string, or as a
tir::Buffer. The string handling worked correctly, but thetir::Bufferobject was handled incorrectly. This commit corrects the handling oftir::Bufferarguments when scheduling, and adds a unit test to validate this behavior.cc @Hzfengsy @junrushao1994