Reorganized SAM-related test data.

compiler/testData/loadJava/compiledJava/sam/adapters/AmbiguousAdapters.java

@@ -0,0 +1,11 @@
+package test;
+
+import java.io.Closeable;
+
+public class AmbiguousAdapters {
+    public void foo(Runnable r) {
+    }
+
+    public void foo(Closeable c) {
+    }
+}