Hzfengsy opened a new pull request #7923:
URL: https://github.com/apache/tvm/pull/7923


   This PR is part of the TensorIR upstreaming effort (#7527) as one of the M1c 
stages, introducing the pass `ConvertBlocksToOpaque` and 
`CompactBufferAllocation`
   
   Pass `ConvertBlocksToOpaque` will substitute all the block vars with the 
PrimExprs they are bound to its iter_values and convert blocks into opaque ones.
   
   Pass `CompactBufferAllocation` compacts the buffer access region by removing 
the buffer regions that are not accessed.
   
   These two passes both are important passes for converting schedulable 
TensorIR to low-level tir.
   
   cc @tqchen @junrushao1994 @comaniac @xqdan @jroesch 
   cc @tqchen @comaniac @jroesch @junrushao1994


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