javac9 and lower bounded wildcards

[Liam Miller-Cushon]

This is a bug, right? It reproduces with javac9-dev at head, and might be
related to JDK-8067858.

===
import java.util.*;

abstract class Test {
  abstract <T> void f(Collection<? super T> i);
  abstract <T> void f(List<? super T> i);

  <T> void m(List<T> a) {
    f(a);
  }
}
===

Test.java:8: error: reference to f is ambiguous
    f(a);
    ^
  both method <T#1>f(Collection<? super T#1>) in Test and method
<T#2>f(List<? super T#2>) in Test match
  where T#1,T#2 are type-variables:
    T#1 extends Object declared in method <T#1>f(Collection<? super T#1>)
    T#2 extends Object declared in method <T#2>f(List<? super T#2>)
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