RFR [9]8139371: Three langtools test failures after the removal of sun.misc.Lock

[Chris Hegarty]

The removal of sun.misc.Lock and a related type (JDK-8139307 [1])
has triggered three langtools test to fail, as they refer to the
removed types:

  tools/javac/proprietary/WarnClass.java
  tools/javac/warnings/6594914/T6594914b.java
  tools/jdeps/APIDeps.java

Another internal type should be used instead. The sun.security.x509
package seems stable, and is being used in other areas, jigsaw/jake,
to test accessibility.

http://cr.openjdk.java.net/~chegar/8139371/webrev.00/

-Chris.

[1] https://bugs.openjdk.java.net/browse/JDK-8139307