Add System.Collections.Specialized.OrderedDictionary as Ordered to the PowerShell type accelerators _{(not sure if this request is related or similar to: #9512)}.

Currently the the-is operator returns an error for the Ordered type although I am able to use it in the constructor:

$Ordered = [Ordered]@{a=1}
$Ordered -is [Ordered]

Unable to find type [Ordered].
At line:1 char:14
+ $Ordered -is [Ordered]
+              ~~~~~~~~~
+ CategoryInfo          : InvalidOperation: (Ordered:TypeName) [], RuntimeException
+ FullyQualifiedErrorId : TypeNotFound

As with e.g. the semver type, I would expect to be able to use the same type (accelerator) for comparison as for the constructor:

$Semver = [semver]'1.2.3'
$Semver -is [semver]
True