8016281: The SAM method should be passed to the metafactory as a MethodType not a MethodHandle

8020010: Move lambda bridge creation from metafactory and VM to compiler

Langtools/javac component of the bridge support and MethodType vs. MethodHandle changes.

Reviewed-by: jjg, vromero, briangoetz, forax

langtools/test/tools/javac/lambda/methodReference/BridgeMethod.java

@@ -112,6 +112,6 @@ public class BridgeMethod {
             Class<?> returnType = m.getReturnType();
             assertTrue(types.remove(returnType.getName()));
         }
-        assertTrue(types.isEmpty());
+        assertTrue(types.size() == 1); //there's a bridge
     }
 }