TestConcurrentBackingReads (7e011fa5) builds its reader pairs with
std::pair {TryReadBacking, TryReadSparseBacking}. Class template argument
deduction then also considers pair's const T1& / const T2& constructors, which
deduce function types, and libstdc++ and libc++ reject a pair member of
function type ("data member instantiated with function type"), so
virtual_memory_allocation_tests no longer compiles on Linux and macOS. MSVC's
library accepts it, which is why Windows still builds.
Take the functions' addresses so the pairs hold function pointers.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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