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39-lock-prefix Add a new UInstr LOCK to represent a "lock" prefix in the instruction stream. This has the same semantics as NOP, but allows a skin to tell whether a group of UInstrs associated with an x86 instruction are meant to be locked. HELGRIND: uses the LOCK UInstr to automatically take and release a special __BUS_HARDWARE_LOCK__ around locked instructions. This only works properly if all instructions touching a given address are locked (even reads). git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1310