Supported propagation of vararg mark.

#KT-2776 in progress

compiler/testData/loadJavaCustom/kotlinSignature/TwoSuperclassesVarargAndNot.java

@@ -0,0 +1,26 @@
+package test;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.String;
+import java.util.List;
+
+import jet.runtime.typeinfo.KotlinSignature;
+import org.jetbrains.jet.jvm.compiler.annotation.ExpectLoadError;
+
+public interface TwoSuperclassesVarargAndNot {
+    public interface Super1 {
+        void foo(String... s);
+    }
+
+    public interface Super2 {
+        void foo(String[] s);
+    }
+
+    public interface Sub extends Super1, Super2 {
+        @ExpectLoadError("Incompatible projection kinds in type arguments of super methods' return types: [String?, out String?]|" +
+                         "Incompatible super methods: some have vararg parameter, some have not|" +
+                         "Incompatible types in superclasses: [Array<String?>, Array<out String?>?]")
+        void foo(String[] s);
+    }
+}

compiler/testData/loadJavaCustom/kotlinSignature/TwoSuperclassesVarargAndNot.txt

@@ -0,0 +1,14 @@
+namespace test
+
+public abstract trait test.TwoSuperclassesVarargAndNot : java.lang.Object {
+    public abstract trait test.TwoSuperclassesVarargAndNot.Sub : test.TwoSuperclassesVarargAndNot.Super1, test.TwoSuperclassesVarargAndNot.Super2 {
+        public abstract override /*1*/ fun foo(/*0*/ p0: jet.Array<out jet.String?>?): jet.Tuple0
+        public abstract override /*1*/ /*fake_override*/ fun foo(/*0*/ vararg p0: jet.String? /*jet.Array<jet.String?>*/): jet.Tuple0
+    }
+    public abstract trait test.TwoSuperclassesVarargAndNot.Super1 : java.lang.Object {
+        public abstract fun foo(/*0*/ vararg p0: jet.String? /*jet.Array<jet.String?>*/): jet.Tuple0
+    }
+    public abstract trait test.TwoSuperclassesVarargAndNot.Super2 : java.lang.Object {
+        public abstract fun foo(/*0*/ p0: jet.Array<out jet.String?>?): jet.Tuple0
+    }
+}