[jdk21u] RFR: 8313262: C2: Sinking node may cause required cast to be dropped [v3]

[Aleksey Shipilev]

On Fri, 25 Aug 2023 17:50:43 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Clean backport to fix recent JDK 21 backport regression.
>> 
>> Additional testing:
>>  - [x] New test fails without the fix, passes with it
>>  - [x] Linux x86_64 AArch64 `tier1 tier2 tier3`
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8313262-c2-sinking-node-cast
>  - Merge branch 'master' into JDK-8313262-c2-sinking-node-cast
>  - Backport 1cee3b9fd9720e7938029a6992460b9053e65e57

Patch is clean. Testing is passing. Push approval granted.

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PR Comment: https://git.openjdk.org/jdk21u/pull/99#issuecomment-1698535974