Reflection: add KTypeParameter.toString

The test covers different type parameters with and without bounds, in case we
decide to also output upper bounds in toString

compiler/testData/codegen/box/reflection/methodsFromAny/typeParametersToString.kt

@@ -0,0 +1,15 @@
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+interface Variance<A, in B, out C, D>
+class OneBound<T : Enum<T>>
+class SeveralBounds<T : Cloneable> where T : Enum<T>, T : Variance<String, Int?, Double?, Number>
+
+fun box(): String {
+    assertEquals("[A, in B, out C, D]", Variance::class.typeParameters.toString())
+    assertEquals("[T]", OneBound::class.typeParameters.toString())
+    assertEquals("[T]", SeveralBounds::class.typeParameters.toString())
+
+    return "OK"
+}

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -12573,6 +12573,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("typeParametersToString.kt")
+            public void testTypeParametersToString() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/methodsFromAny/typeParametersToString.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("typeToString.kt")
             public void testTypeToString() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/methodsFromAny/typeToString.kt");