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A minimal patch for the EAF flags discovery. It works only in local ipa-modref and gives up on cyclic SSA graphs. It improves pt_solution_includes disambiguations twice. gcc/Changelog: * gimple.c: Include ipa-modref-tree.h and ipa-modref.h. (gimple_call_arg_flags): Use modref to determine flags. * ipa-modref.c: Include gimple-ssa.h, tree-phinodes.h, tree-ssa-operands.h, stringpool.h and tree-ssanames.h. (analyze_ssa_name_flags): Declare. (modref_summary::useful_p): Summary is also useful if arg flags are known. (dump_eaf_flags): New function. (modref_summary::dump): Use it. (get_modref_function_summary): Be read for current_function_decl being NULL. (memory_access_to): New function. (deref_flags): New function. (call_lhs_flags): New function. (analyze_parms): New function. (analyze_function): Use it. * ipa-modref.h (struct modref_summary): Add arg_flags. * doc/invoke.texi (ipa-modref-max-depth): Document. * params.opt (ipa-modref-max-depth): New param.
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