master
8245455: Remove alternative StringConcatFactory strategies
8297530: java.lang.IllegalArgumentException: Negative length on strings concatenation
8247681: Improve bootstrapping of unary concatenations
8245959: Extend String concat testing to account for folded constants
8267773: PhaseStringOpts::int_stringSize doesn't handle min_jint correctly
8267184: Add -Djava.security.manager=allow to tests calling System.setSecurityManager
8187443: Forest Consolidation: Move files to unified layout