Add fuzzilli differential executions patch for DUMPLING

DUMPLING is a mode for differential fuzzers that compares the full state of optimized and unoptimized execution for arbitrary JS programs.

This commit implements the JIT sensitive differential testing and differential oracle components of DUMPLING. It extends Fuzzilli with the capability of differential executions.

Co-authored-by: Mathias Payer <mathias.payer@gmail.com> 
Co-authored-by: Liam Wachter <liam.g.wachter@gmail.com>
Co-authored-by: Flavio Toffalini<flavio87@gmail.com> 
Co-authored-by: Christian Wressnegger <intellisec.de@gmail.com>

Author: 4 people