Request to backport 6908259: Covariance bug for multiple interface inheritance

[Deepak Bhole]

Hi,

We have encountered a compilation issue with OpenJDK6 that is fixed in
OpenJDK7. To that end, I would like to backport this changeset to OpenJDK6:

http://hg.openjdk.java.net/jdk7/tl/langtools/raw-rev/4a3b9801f7a0

author	mcimadamore
changeset 50	4a3b9801f7a0
parent 49	8bc2ca2a3b0a
child 51	29d2485c1085

6294779: Problem with interface inheritance and covariant return types
Summary: Problematic overriding check when two methods defined in two distinct superinterfaces are overriden by an interface
Reviewed-by: jjg

Okay to push?

Cheers,
Deepak