Angora is a mutation-based fuzzer. The main goal of Angora is to increase branch coverage by solving path constraints without symbolic execution.
Implementation of Never-zero counter: The idea is from Marc and Heiko in AFLPlusPlus . https://github.com/vanhauser-thc/AFLplusplus/blob/master/llvm_mode/README.neverzero
add inst_ratio : issue #67
fix asan compatible: did not instrument function startswith "asan.module"