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* ipa-pure-const.c (struct funct_state_d): Add can_free field. (varying_state): Add true for can_free. (check_call): For builtin or internal !nonfreeing_call_p set local->can_free. (check_stmt): For asm volatile and asm with "memory" set local->can_free. (analyze_function): Clear local->can_free initially, continue calling check_stmt until all flags are computed, dump can_free flag. (pure_const_write_summary): Write can_free flag. (pure_const_read_summary): Read it back. (propagate_pure_const): Propagate also can_free flag, set w->nonfreeing_fn if it is false after propagation. * cgraph.h (cgraph_node): Add nonfreeing_fn member. * gimple.c: Include ipa-ref.h, lto-streamer.h and cgraph.h. (nonfreeing_call_p): Return cgraph nonfreeing_fn flag if set. Also return true for IFN_ABNORMAL_DISPATCHER. * cgraph.c (cgraph_node::dump): Dump nonfreeing_fn flag. * lto-cgraph.c (lto_output_node): Write nonfreeing_fn flag. (input_overwrite_node): Read it back. From-SVN: r217582
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