Fixed loading variance from alternative signature.

compiler/testData/loadJava/kotlinSignature/CustomVariance.java

@@ -0,0 +1,12 @@
+package test;
+
+import java.util.*;
+
+import jet.runtime.typeinfo.KotlinSignature;
+
+public class CustomVariance {
+    @KotlinSignature("fun foo(): MutableList<out Number>")
+    public List<Number> foo() {
+        throw new UnsupportedOperationException();
+    }
+}

compiler/testData/loadJava/kotlinSignature/CustomVariance.kt

@@ -0,0 +1,7 @@
+package test
+
+import java.util.*
+
+public open class CustomVariance : Object() {
+    public open fun foo() : MutableList<out Number> = throw UnsupportedOperationException()
+}

compiler/testData/loadJava/kotlinSignature/CustomVariance.txt

@@ -0,0 +1,6 @@
+namespace test
+
+public open class test.CustomVariance : java.lang.Object {
+    public final /*constructor*/ fun <init>(): test.CustomVariance
+    public open fun foo(): jet.MutableList<out jet.Number>
+}