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Hi LLVMdev, llvm::PassManagerBuilder allows to customize the default pass sequenceby registering passes at specific extension points.However all of theextensions if the -O0 flag is added to the command line; as thecomment says, "If all optimizations are disabled, just run thealways-inline pass."This doesn't play well with _instrumentation_passes which should not be disabled regardless of the optimizationlevel. My proposal is to add a specific extension point to preserve a passeven if O0 is used (below is the usage example with theAddressSanitizer pass)Another soluti...