889dfd4ab3
Prior to this patch, calling `cpp::bit_cast<T>` in `constexpr` expressions under `-fsanitize=memory` would fail with the following message "non-constexpr function '__msan_unpoison' cannot be used in a constant expression". This patch makes sure that the `__msan_unpoison` expression is guarded by `!__builtin_is_constant_evaluated()`.
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