[lworld] RFR: Merge jdk

[David Simms]

On Mon, 11 Oct 2021 08:51:22 GMT, David Simms <dsimms at openjdk.org> wrote:

> Merge jdk-18+18

There known issues remaining with this merge: 

- [JDK-8274973](https://bugs.openjdk.java.net/browse/JDK-8274973)
- [JDK-8274972](https://bugs.openjdk.java.net/browse/JDK-8274972)
- [JDK-8274950](https://bugs.openjdk.java.net/browse/JDK-8274950)

Includes the following test failures:
- compiler/valhalla/inlinetypes/TestLWorld.java
- compiler/c2/irTests/TestPostParseCallDevirtualization.java
- compiler/valhalla/inlinetypes/TestArrays.java
- valhalla/valuetypes/ValueArray.java

Fixes to come post integration

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PR: https://git.openjdk.java.net/valhalla/pull/559