8187487: crash with classes with same binary name

Reviewed-by: jjg

test/langtools/tools/javac/T8187487/CrashWithDuplicateClassNamesTest.java

@@ -0,0 +1,20 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8187487
+ * @summary crash with duplicate class name
+ * @compile/fail/ref=CrashWithDuplicateClassNamesTest.out -XDrawDiagnostics CrashWithDuplicateClassNamesTest.java
+ */
+
+class CrashWithDuplicateClassNamesTest {
+    static class C1$C2 {}
+
+    static class C1 {
+        static class C2 {}
+    }
+
+    static class C3 {
+        static class C4 {}
+    }
+
+    static class C3$C4 {}
+}