[Analysis/Allocation] Allocation passes now assumes that slices always alias (#108)

This code in this branch assumes the `src` operand in
`insert_slice_async` always aliases the result, which shouldn't hold for
generally cases but is just a workaround to make the pipeline pass work.

I'm also working on the complete analysis in another
[branch](https://github.com/openai/triton-mlir/tree/keren/analyze-slice).

lib/Dialect/TritonGPU/Transforms/Combine.cpp

@@ -119,7 +119,9 @@ public:
       return mlir::failure();
 
     auto blacklist = [](Operation *op) {
-      if (isa<triton::gpu::CopyAsyncOp, triton::LoadOp, triton::StoreOp>(op))
+      if (isa<triton::gpu::ExtractSliceOp, triton::gpu::AllocTensorOp,
+              triton::gpu::InsertSliceAsyncOp, triton::LoadOp, triton::StoreOp>(
+              op))
         return true;
       if (isa<scf::YieldOp, scf::ForOp>(op))
         return true;