Implement never-zero counter and inst_ratio #69
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// The idea is from Marc and Heiko in AFLPlusPlus // Reference: : https://github.com/vanhauser-thc/AFLplusplus/blob/master/llvm_mode/README.neverzero and AFLplusplus/AFLplusplus#10
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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 Configurable instrumentation ratio #67
fix asan compatible: did not instrument function startswith "asan.module"