As part of the effort to remove bridging complexity form VM and metafactory, the compiler should start generating bridges in interfaces. There are two scenario we need to cover:

1) Generate bridges in interface using existing bridging logic
2) Pass the metafactory additional bridging info so that the functional interface is correctly implemented

The first part is simple; it means generating bridges in cases like the following:

interface A {
   Object m();
}

interface B extends A {
   String m();
   //there should be a bridge to A.m()Object
}

The second part is more subtle, as current bridging logic doesn't cover cases like:

interface A {
   Object m();
}

interface B {
   String m();
}

interface C extends A, B { }