JDK 9 RFR: JDK-8177146 MethodHandles.Lookup::bind allows illegal protected access

[Ron Pressler]

Hi.
Please review,

Bug: https://bugs.openjdk.java.net/browse/JDK-8177146
Webrev: 
http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8177146-bind-protected-method/webrev/

-----

The patch contains a few changes:

1. The method `getDirectMethodCommon`, was changed so that if narrowing 
due to protected method access must be done, it will be done regardless 
of the flag doRestrict.

2. The private method ` getDirectMethodNoRestrict` was renamed to ` 
getDirectMethodNoRestrictInvokeSpecial`.

3. The method `bind` was changed to throw the correct exception type, 
IAException.

4. `restrictReceiver` was changed such that it never widens the receiver 
type. This could happen when the receiver was a subclass of the caller 
class, and triggered the assertion (this happened not only in calls to 
`bind` but also to `findVirtual`).

-----

Thanks
Ron