[tree-ssa, C++] PATCH to ALIAS_DECL handling

[Jason Merrill]

This call to unshare_expr got lost in the switch to the new parser.

Tested athlon-pc-linux-gnu, applied to tree-ssa.

2003-08-19  Jason Merrill  <jason@redhat.com>

	* semantics.c (finish_id_expression): Unshare aliases.

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