Don't obtain constraint if doing so would cause circularity

Author: ahejlsberg

src/compiler/checker.ts

@@ -16572,7 +16572,8 @@ namespace ts {
                         if (t.flags & (TypeFlags.AnyOrUnknown | TypeFlags.InstantiableNonPrimitive | TypeFlags.Object | TypeFlags.Intersection) && t !== wildcardType && !isErrorType(t)) {
                             if (!type.declaration.nameType) {
                                 let constraint;
-                                if (isArrayType(t) || (t.flags & TypeFlags.Any) && (constraint = getConstraintOfTypeParameter(typeVariable)) && everyType(constraint, or(isArrayType, isTupleType))) {
+                                if (isArrayType(t) || t.flags & TypeFlags.Any && findResolutionCycleStartIndex(typeVariable, TypeSystemPropertyName.ImmediateBaseConstraint) < 0 &&
+                                    (constraint = getConstraintOfTypeParameter(typeVariable)) && everyType(constraint, or(isArrayType, isTupleType))) {
                                     return instantiateMappedArrayType(t, type, prependTypeMapping(typeVariable, t, mapper));
                                 }
                                 if (isGenericTupleType(t)) {