Google Chrome 80 JSCreate side-effect type confusion exploit

This module exploits an issue in Google Chrome 80.0.3987.87 (64 bit). The exploit
corrupts the length of a float array (float_rel), which can then be used for out
of bounds read and write on adjacent memory.
The relative read and write is then used to modify a UInt64Array (uint64_aarw)
which is used for read and writing from absolute memory.
The exploit then uses WebAssembly in order to allocate a region of RWX memory,
which is then replaced with the payload shellcode.
The payload is executed within the sandboxed renderer process, so the browser
must be run with the --no-sandbox option for the payload to work correctly.