3dc6b0fcb2
I left this one as a separate commit because it is more involved. We want people to compile with valgrind support, but we don't want to use a slow hash function unless we're actually running under valgrind. So the compile-time check is changed to a runtime check. When compiled with optimization, the compiler should elide the checks on the constants, and only leave the check for RUNNING_ON_VALGRIND. It is wrapped with _unlikely_ so that the else branch is put in the hot path.
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