[jdk18u] RFR: 8284848: C2: Compiler blackhole arguments should be treated as globally escaping [v2]

[Murat KALENDEROGLU]

On Wed, 4 May 2022 15:50:33 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Unclean backport to improve Blackhole - EA interactions. The backport is not clean, because `IRNode` needs missing constants, and `set_escape_state` does not accept third argument (description) in 18u.
>> 
>> Additional testing:
>>  - [x] `compiler/c2/irTests/blackhole` fail without the patch, pass with it
>>  - [x] `compiler/blackhole` continue to pass
>
> 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 two additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8284848-blackhole-ea
>  - Backport 5629c7555f9bb779c57f45dfb071abbb1d87bb7d

Marked as reviewed by brandingfuture at github.com (no known OpenJDK username).

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PR: https://git.openjdk.java.net/jdk18u/pull/118