7073296: Review : Bug in Executable.equalParamTypes() results in incorrect comparison for differing number of params

[Mike Duigou]

Hello All;

A fairly simple bug to review which snuck through testing.

http://cr.openjdk.java.net/~mduigou/7073296/0/webrev/

The changes to Class are incidental but so trivial that opted to include them. I can remove if anyone feels strongly (or even weakly) that they should be excluded.

Mike