The solution is included in 2.1.0-beta3: "LuaJIT for x64 can optionally be built for LJ_GC64 mode by enabling the -DLUAJIT_ENABLE_GC64 line in src/Makefile or via 'msvcbuild.bat gc64'." "This mode removes
the 32 bit limitation for garbage collected memory on 64 bit systems." [0]