17328f36f6
zero-density.s causes spurious NFC mismatches, e.g. https://lab.llvm.org/buildbot/#/builders/92/builds/21380 This is caused by NFC script wrapping llvm-bolt binary only, so that perf2bolt invocations are replaced by `llvm-bolt --agregate-only` to achieve perf2bolt behavior. Add `show-density` to the list of flags wrapping perf2bolt calls to avoid similar issues in the future. Test Plan: ``` $ bolt/utils/nfc-check-setup.py --switch-back $ bin/llvm-lit -a tools/bolt/test/X86/zero-density.s ```