Integrated: 8341871: Disable G1 for unsupported platforms after JDK-8334060

[Aleksey Shipilev]

On Mon, 14 Oct 2024 13:08:32 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> This implicitly fixes x86-32 builds that fail at runtime, because late barrier expansion is not implemented for them. I think about this check as something that we should have done as part of original JDK-8334060.
> 
> The first version was summarily disabling G1 on platforms not explicitly listed in arches. Unfortunately, that affects Zero, while the problem we are working out is G1+C2 support. The second revision of this PR checks for `compiler2` and x86-32 explicitly, and disables G1 only then.
> 
> Additional testing:
>  - [x] Linux x86_32 server fastdebug, `make bootcycle-images` now passes
>  - [x] A matrix of (server, zero) builds on different platforms

This pull request has now been integrated.

Changeset: 6ed6dff2
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/6ed6dff22208e7e6c24c98d3a9ff895a6c6c0ae0
Stats:     19 lines in 1 file changed: 19 ins; 0 del; 0 mod

8341871: Disable G1 for unsupported platforms after JDK-8334060

Reviewed-by: mdoerr, erikj

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PR: https://git.openjdk.org/jdk/pull/21493