RFR: 8252505: C1/C2 compiler support for blackholes [v24]

[Thomas Wuerthinger]

On Sun, 6 Dec 2020 18:38:27 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> Thank you all, that was a wild ride.
>
> Looks much better! No platform dependent changes and seems relatively straightforward.
> 
> Since it's only used by `BlackholeNode` then maybe `RegMask::All` should have been a field in `BlackholeNode` rather than a global?
> 
> (Caught a cold last week and lost track of this - apologies for going silent and being late to the party here.)

Is this the first compile command that can be used to modify the functional behaviour of the Java user application?

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PR: https://git.openjdk.java.net/jdk/pull/1203