Fix variance problems.

compiler/testData/codegen/box/properties/primitiveOverrideDefaultAccessor.kt

@@ -1,4 +1,4 @@
-trait R<in T: Comparable<T>> {
+trait R<T: Comparable<T>> {
     var value: T
 }
 

compiler/testData/codegen/box/properties/primitiveOverrideDelegateAccessor.kt

@@ -3,7 +3,7 @@ class Holder(var value: Int) {
     fun set(that: Any?, desc: PropertyMetadata, newValue: Int) { value = newValue }
 }
 
-trait R<in T: Comparable<T>> {
+trait R<T: Comparable<T>> {
     var value: T
 }
 

compiler/testData/codegen/box/typeInfo/inheritance.kt

@@ -1,4 +1,4 @@
-open class A<out T> () {
+open class A<T> () {
    fun plus(e: T) = B<T> (e)
 }