8212982: Rule cases in switch expression accepted even if complete normally Summary: Ensure an error is reported if switch expression does not correctly produce a value. Reviewed-by: mcimadamore

8214025: assert(t->singleton()) failed: must be a constant when ScavengeRootsInCode < 2 Summary: Added missing null checks and checks for pending exception. Reviewed-by: kvn

8209923: Unicode 11.0.0. Summary: Updated JDK to support Unicode 11.0.0. Reviewed-by: naoto

8213419: C2 may hang in MulLNode::Ideal()/MulINode::Ideal() with gcc 8.2.1 Reviewed-by: kvn, dlong, aph