remove setitem_ output manipulation (#2427)

Author: beverlylytle

thunder/core/update_aliases.py

@@ -56,25 +56,6 @@ def _involves_viewed_args(bsym, viewed):
     return any(isinstance(p, TensorProxy) and variableify(p) in viewed for p in bsym.flat_proxy_args)
 
 
-def _add_output_to_setitem(trace: Trace) -> Trace:
-    def helper(bsym):
-        if bsym.sym is not setitem_:
-            return bsym
-        sym = bsym.sym
-        new_bsym = sym.bind(
-            *bsym.args,
-            **bsym.kwargs,
-            output=bsym.subsymbols[1].output,
-            subsymbols=bsym.subsymbols,
-            _call_ctx=bsym._call_ctx,
-        )
-        return new_bsym
-
-    new_symbols = [helper(bound_symbol) for bound_symbol in trace.bound_symbols]
-    trace.bound_symbols = new_symbols
-    return trace
-
-
 def replace_args_with_alias_map(
     computation_trace: Trace,
     alias_tensor_indices: list[list[int]],
@@ -140,7 +121,6 @@ def insert_alias_updates(computation_trace: Trace, alias_tensor_indices: list[li
     # First pass: identify inputs which are views of each other and swap them out with a default,
     # reshaping if necessary.
     computation_trace, _ = replace_args_with_alias_map(computation_trace, alias_tensor_indices)
-    computation_trace = _add_output_to_setitem(computation_trace)
 
     # Second pass: identify views, their originals, and operands involved in inplace ops
     view_groups = []