alias.c (get_alias_set): Try to replace PLACEHOLDER_EXPR.
* alias.c (get_alias_set): Try to replace PLACEHOLDER_EXPR. Loop through NOPs, placeholders, and components. Don't go through NOPs if change mode. (record_alias_subset): Do nothing if SUBSET and SET are the same. * emit-rtl.c (set_mem_alias_set): Enable check. * expr.c (find_placeholder): New function. (expand_expr, case PLACEHOLDER_EXPR): Use it. (expand_expr, case COMPONENT_EXPR): Always copy OP0 when we need to modify it and avoid unneeded copies. * expr.h (expand_expr): Always define. (find_placeholder): New declaration. From-SVN: r45931
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