Revert "MSE-32 Removed overactive check in always_memcmp"
Revert "MSE-32 Removed overactive check in always_memcmp"

This reverts commit ea7613ffd4f27cd1b5dfb1efa72dd1b24c724c6d.

percona/PerconaFT,kuszmaul/PerconaFT,ottok/PerconaFT,kuszmaul/PerconaFT,kuszmaul/PerconaFT-tmp,kuszmaul/PerconaFT,kuszmaul/PerconaFT,kuszmaul/PerconaFT-tmp,ottok/PerconaFT,BohuTANG/ft-index,kuszmaul/PerconaFT-tmp,ottok/PerconaFT,kuszmaul/PerconaFT-tmp,percona/PerconaFT,percona/PerconaFT,BohuTANG/ft-index,BohuTANG/ft-index,BohuTANG/ft-index,percona/PerconaFT,ottok/PerconaFT