java.lang.instrument.Instrumentation.appendToBootstrapClassLoaderSearch

and

  java.lang.instrument.Instrumentation.appendToClassPath

will need to be removed (see 5055293). There are four regression tests
in test/java/lang/instrument which test these two methods:

  AppendToBootstrapClassPathTest.java
  AppendToClassPathTest.java
  NullAppendToBootstrapClassPathTest.java
  NullAppendToClassPathTest.java

the @ignore tag needs to be added to them in advanvce since the underlying
hotspot functionality will go away asynchronously