Merge branch 'dev' of https://github.com/AFLplusplus/AFLplusplus into dev

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diff --git a/llvm_mode/README.neverzero.md b/llvm_mode/README.neverzero.md
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-# NeverZero counters for LLVM instrumentation
-
-## Usage
-
-In larger, complex or reiterative programs the counters that collect the edge
-coverage can easily fill up and wrap around.
-This is not that much of an issue - unless by chance it wraps just to a value
-of zero when the program execution ends.
-In this case afl-fuzz is not able to see that the edge has been accessed and
-will ignore it.
-
-NeverZero prevents this behaviour. If a counter wraps, it jumps over the value
-0 directly to a 1. This improves path discovery (by a very little amount)
-at a very little cost (one instruction per edge).
-
-(The alternative of saturated counters has been tested also and proved to be
-inferior in terms of path discovery.)
-
-This is implemented in afl-gcc, however for llvm_mode this is optional if
-the llvm version is below 9 - as there is a perfomance bug that is only fixed
-in version 9 and onwards.
-
-If you want to enable this for llvm versions below 9 then set
-
-```
-export AFL_LLVM_NOT_ZERO=1
-```
-
-In case you are on llvm 9 or greater and you do not want this behaviour then
-you can set:
-```
-AFL_LLVM_SKIP_NEVERZERO=1
-```
-If the target does not have extensive loops or functions that are called
-a lot then this can give a small performance boost.