Fix primitive override problem in Kotlin-Java inheritance

See the comment in JetTypeMapper

compiler/testData/codegen/bytecodeText/noWrapperForMethodReturningPrimitive.kt

@@ -0,0 +1,10 @@
+class A {
+    fun foo(): Int = 42
+}
+
+fun bar() = A().foo()
+
+// Test that for a simple final method in a final class we don't generate a bridge returning wrapper type
+// (we only generate the method returning a primitive int)
+
+// 0 foo\(\)Ljava/lang/Integer;