RFR: 8360884: Better scoped values

[Alan Bateman]

On Fri, 27 Jun 2025 14:32:11 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Scoped values cannot be used early in the JDK boot process because of some dependencies on System.getProperty().

Just a bit more context here. There are several places where a class initializer may create a ScopedValue. This must be very cheap and allow for uses in classes that are used early in VM startup, e.g. Charset. Right now we can work round it with StableValue<ScopedValue>> but that is excessive.

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PR Comment: https://git.openjdk.org/jdk/pull/26019#issuecomment-3015041962