Integrated: Fix non-supported platforms release builds

[Aleksey Shipilev]

On Thu, 14 Oct 2021 13:36:45 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> It seems when doing #72, I missed a spot that makes release builds fail for non-supported platforms. I am not sure why fastdebug passes, but oh well. The fix is to platform-ifdef the offending block, like we do in other places.
> 
> Additional testing:
>  - [x] Linux x86_64 Zero release builds now
>  - [x] Linux x86_64 Server fastdebug/release pass `jdk_loom hotspot_loom`

This pull request has now been integrated.

Changeset: 5b1a3a61
Author:    Aleksey Shipilev <shade at openjdk.org>
Committer: Ron Pressler <rpressler at openjdk.org>
URL:       https://git.openjdk.java.net/loom/commit/5b1a3a61071ea4e651acb7d113f37a6c3ff45094
Stats:     5 lines in 1 file changed: 5 ins; 0 del; 0 mod

Fix non-supported platforms release builds

Reviewed-by: rpressler

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PR: https://git.openjdk.java.net/loom/pull/75