Add testcase for fixed issue

#KT-9850 Fixed

compiler/testData/diagnostics/tests/override/typeParameters/kt9850.kt

@@ -0,0 +1,8 @@
+abstract class Base {
+    abstract fun <T> foo(list: List<T>) where T : Number, T : Comparable<T>
+}
+
+class Derived : Base() {
+    override fun <T> foo(list: List<T>) where T : Number, T : Comparable<T> {
+    }
+}

compiler/testData/diagnostics/tests/override/typeParameters/kt9850.txt

@@ -0,0 +1,17 @@
+package
+
+public abstract class Base {
+    public constructor Base()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun </*0*/ T : kotlin.Number> foo(/*0*/ list: kotlin.List<T>): kotlin.Unit where T : kotlin.Comparable<T>
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Derived : Base {
+    public constructor Derived()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ fun </*0*/ T : kotlin.Number> foo(/*0*/ list: kotlin.List<T>): kotlin.Unit where T : kotlin.Comparable<T>
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}