[llvm] [mlir][bufferization] Add OwnershipBasedBufferDeallocation pass option to forbid clones (PR #66626)

[Martin Erhart via llvm-commits]

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@@ -56,7 +56,7 @@ def BufferDeallocationOpInterface :
           method (which is especially important if operations are created that
           cannot be easily canonicalized away anymore).
         }],
-        /*retType=*/"std::pair<Value, Value>",
+        /*retType=*/"FailureOr<std::pair<Value, Value>>",
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maerhart wrote:

I changes the way ownership indicators are materialized in the default case when internal ownership is set to 'Unknown' such that we don't need to return a failure anymore

https://github.com/llvm/llvm-project/pull/66626