Fix #500: Avoid removal of duplicate percentage signs by Node.js
Fix #501: Never eliminate ClassData of hijacked classes
Fix #503: Never eliminate RuntimeLong.fromDouble
Fix #504: Fix typo in java.lang.Class (getSuperClass -> getSuperclass)
Fix #505: Implement StringBuilder(Buffer).setCharAt
Fix #508: Ignore irrelevant DCE warnings in partest
Fix #492: Classify last partests. Partests fully work with --fastOpt