[patch] Decrease # of update_stmt calls from alias analysis

[Diego Novillo]

On 03/01/06 05:23, Zdenek Dvorak wrote:

> 	* tree-flow.h (struct stmt_ann_d): Add has_virtual_ops field.
> 	* tree-ssa-structalias.c (find_func_aliases): Only mark
> 	the statements that may have virtual operands for rescanning.
> 	* tree-ssa-operands.c (build_ssa_operands, get_expr_operands,
> 	get_asm_expr_operands, get_call_expr_operands): Set has_virtual_ops
> 	field.
> 
No.  Not another state flag to keep up-to-date.  Particularly if it
gives no benefit.  Use stmt_references_memory_p, if you must.