Revert "64-bit: LockWord class fixed"

This reverts commit 6a9fd8c4f3056d8289b0aa163365b0e4c305d200.
Revert "64-bit: more pointer arithmetic workarounds"

This reverts commit 98c652640c6bd7cd8189b96f41315539be3f435e.
Revert "64-bit: more workarounds"

This reverts commit 79b37383e860d04c13083f74ab9b0b55c855613b.