Lua's native Number type is a 64-bit double with 52-bit precision, which
was causing rounding errors when storing and working with high-range
memory addresses (namely, addresses from the kernel, which are all in
the `0xffffffff........` range).

To work around this, we've made sure to never call `tonumber` on any
variables that represent memory addresses, and instead continue
operating on them with their native types: LuaJIT can work with the
underlying `uint64_t` type for these values and transparently perform
all kinds of numeric operations.

The only limitation of working with native 64-bit types in LuaJIT is
that they cannot be printed with the language's default `string.format`
API. To give better UX to probe writers, these APIs have been
monkeypatched so the `%p` format specifier will now properly handle
64-bit addresses and print them in an appropriate format.