Normative use of a .NET constant not required by this C# spec

[This issue was spun-off from Issue #1378 [sub-issue 7](https://github.com/dotnet/csharpstandard/issues/1378#issuecomment-3094642231).]

In [23.5.6.2, "The CallerLineNumber attribute,"](https://github.com/dotnet/csharpstandard/blob/draft-v8/standard/attributes.md#23562-the-callerlinenumber-attribute), we have the following:

> The attribute `System.Runtime.CompilerServices.CallerLineNumberAttribute` is allowed on optional parameters when there is a standard implicit conversion ([§10.4.2](conversions.md#1042-standard-implicit-conversions)) from the constant value `int.MaxValue` to the parameter’s type. This ensures that any non-negative line number up to that value can be passed without error.

However, `int.MaxValue` is not part of this specification. How might we reword this normative text to get around that? Or might we add the minima/maxima constants for the built-in types?