RFR: 8320649: C2: Optimize scoped values [v4]

[Roland Westrelin]

On Wed, 17 Jan 2024 11:12:24 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> No visited set. Can this trigger an exponential explosion with if/region diamonds?

It only follows the control subgraph for the `ScopedValue.get()` which is fairly simple.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16966#discussion_r1466640810