re PR middle-end/50604 (verify_gimple failed: type mismatch in binary expression)
PR tree-optimization/50604
* builtins.c (fold_builtin_strcpy, fold_builtin_stpcpy,
fold_builtin_strncpy, fold_builtin_stxcpy_chk): Ensure
last argument to memcpy has size_type_node type instead of
ssizetype.
* tree-ssa-strlen.c (handle_builtin_memcpy): Use size_type_node
instead of TREE_TYPE (len) as type for newlen.