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* tree-object-size.c (pass_through_call): Use gimple_call_return_flags ERF_RETURN*ARG* for builtins other than BUILT_IN_ASSUME_ALIGNED, check for the latter with gimple_call_builtin_p. Do not handle BUILT_IN_STPNCPY_CHK which is not a pass through call. * gcc.dg/builtin-object-size-18.c: New test. From-SVN: r255133
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