RFR(S+M) / 8022701 Accessibility checking: InvocationTargetException is thrown instead of IllegalAccessError

[David Chase]

new, improved webrev: http://cr.openjdk.java.net/~drchase/8022701/webrev.02/
Same small changes to the sources, plus a test.

bug: wrong exception was thrown in call of methodhandle to private method

fix: detect special case of IllegalAccessException, convert to IllegalAccessError

testing:
verified that the test would pass with modified library
verified that the test would fail with old library
verified that the test would fail if the class substitution (for some reason) did not occur
jtreg of jdk/test/java/lang/invoke -- note that the new exception thrown is a subtype of the old one, so this is unlikely to create a new surprise