Optnone issues

One small issue is that compiling with “clang -O0”, while producing valid, unoptimized llvm IR adds “optnone” tags to the llvm basic blocks. This means that further optimizations (for instance passes run through opt) will have no change on the code. Optnone is not easily manually removed, not should it be since often optnone is used for code that really should not be optimized (as in code can be generated that opt will not deal well with and removing it might break the llvm module if further optimizations run). This is an easy issue to avoid now that we are aware, since clang provides a “-disable-llvm-optzns” flag that works for what we want instead. It simply caused headaches prior to figuring it out and will be useful to note for future capstone members.