Remove manual mixins in JFunctionN.v2.12.0-M3-dc9effe

These manual mixins were forwarding to the impl classes have
just been removed. We can now rely on default methods instead.

Update Tests:

 - Fix test/files/pos/t1237.scala, we can't have an outer field
   in an interface, always use the outer method.
 - Don't crash on meaningless trait early init fields
   test/files/neg/t2796.scala
 - Remove impl class relate parts of inner class test
 - Remove impl class relate parts of elidable test
 - Remove impl class related reflection test.
 - Remove test solely about trait impl classes renaming
 - Update check file with additional stub symbol error
 - Disable unstable parts of serialization test.
    - TODO explain, and reset the expectation

1 files changed, 22 insertions, 4 deletions

diff --git a/test/files/run/mixin-signatures.check b/test/files/run/mixin-signatures.check
index 3031fe75af..77bff79ac8 100644
--- a/test/files/run/mixin-signatures.check
+++ b/test/files/run/mixin-signatures.check
@@ -48,12 +48,30 @@ class Test$bar5$ {
   public java.lang.Object Test$bar5$.h(java.lang.Object)
 }
 
-class Foo1$class {
-  public static java.lang.String Foo1$class.f(Foo1,java.lang.Object)
+interface Foo1 {
+  public abstract java.lang.Object Base.f(java.lang.Object)
+    generic: public abstract R Base.f(T)
+  public default java.lang.String Foo1.f(java.lang.Object)
+    generic: public default java.lang.String Foo1.f(T)
+  public abstract java.lang.Object Base.g(java.lang.Object)
+    generic: public abstract R Base.g(T)
+  public abstract java.lang.String Foo1.g(java.lang.Object)
+    generic: public abstract java.lang.String Foo1.g(T)
+  public default java.lang.Object Base.h(java.lang.Object)
+    generic: public default R Base.h(T)
 }
 
-class Foo2$class {
-  public static java.lang.Object Foo2$class.f(Foo2,java.lang.String)
+interface Foo2 {
+  public abstract java.lang.Object Base.f(java.lang.Object)
+    generic: public abstract R Base.f(T)
+  public default java.lang.Object Foo2.f(java.lang.String)
+    generic: public default R Foo2.f(java.lang.String)
+  public abstract java.lang.Object Base.g(java.lang.Object)
+    generic: public abstract R Base.g(T)
+  public abstract java.lang.Object Foo2.g(java.lang.String)
+    generic: public abstract R Foo2.g(java.lang.String)
+  public default java.lang.Object Base.h(java.lang.Object)
+    generic: public default R Base.h(T)
 }
 
 000000000000000000000000000000000000