Fix for a cyclic generic upper bound for a class type parameter. A pair of tests.

compiler/testData/diagnostics/tests/regressions/itselfAsUpperBoundInClass.kt

@@ -0,0 +1 @@
+class MyClass<T: <!CYCLIC_GENERIC_UPPER_BOUND!>T?<!>>

compiler/testData/diagnostics/tests/regressions/itselfAsUpperBoundInClass.txt

@@ -0,0 +1,8 @@
+package
+
+internal final class MyClass</*0*/ T : [ERROR : Cyclic upper bound: T?]> {
+    public constructor MyClass</*0*/ T : [ERROR : Cyclic upper bound: T?]>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/tests/regressions/itselfAsUpperBoundInClassNotNull.kt

@@ -0,0 +1 @@
+class MyClass<T: <!CYCLIC_GENERIC_UPPER_BOUND!>T<!>>

compiler/testData/diagnostics/tests/regressions/itselfAsUpperBoundInClassNotNull.txt

@@ -0,0 +1,8 @@
+package
+
+internal final class MyClass</*0*/ T : [ERROR : Cyclic upper bound: T]> {
+    public constructor MyClass</*0*/ T : [ERROR : Cyclic upper bound: T]>()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}