8068639: Make certain annotation classfile warnings opt-in Reviewed-by: jjg

8059977: StandardJavaFileManager should support java.nio.file.Path Reviewed-by: jlahoda

8067883: Javac misses some opportunities for diagnostic simplification Summary: Javac always report full inference diagnostic, even when message does not mention inference variables. Reviewed-by: jlahoda

8064857: javac generates LVT entry with length 0 for local variable Reviewed-by: mcimadamore, jjg