Prevent copying uninitialized data in AssignOp
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#53997
Merged
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This prevents harder to debug undefined behaviors that cannot be traced back to the original tensor after assignments occur earlier in the graph execution. Several of these undefined behaviors are just reference bindings to null pointers, which are caught when running under ubsan/asan.
PiperOrigin-RevId: 408654780
Change-Id: Iad2ec40d43f5fd7ea016c20283356c12d5ddeab1