RFR: JVM detect null checked flag

[Chen Liang]

On Wed, 4 Feb 2026 21:44:21 GMT, Chen Liang <liach at openjdk.org> wrote:

> `test/jdk/valhalla/valuetypes/Reflection.java` confirms that a value `!` field now generates the same VM field flag as `@NullRestricted`; this is verified by `ValueClass.isNullRestrictedField` which reads from the VM field flag.
> 
> We can now throw away the javac hack that injects `@NullRestricted`.

Thanks for the review

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PR Comment: https://git.openjdk.org/valhalla/pull/2041#issuecomment-3850008245