Bionic's sys/user.h declares a "struct user". The header tends to be
included, and when it is, it conflicts with "namespace user". Rename
user to User.
Differential Revision: https://reviews.llvm.org/D139380
Implement LWG 3629, by making lookup for make_error_code and
make_error_condition only consider names found by ADL. This is achieved
by adding a block scope using-declaration for a function that will be
found by unqualified lookup, preventing unqualified lookup from
continuing to enclosing scopes (the class scope, then enclosing
namespaces). The function named by the using declaration is not
viable, so overload resolution must select a candidate found by ADL.
This fixes https://github.com/llvm/llvm-project/issues/57614
Differential Revision: https://reviews.llvm.org/D134943
