Integrated: Fix builds that do not have Shenandoah or other GCs

[Aleksey Shipilev]

On Wed, 17 Feb 2021 08:40:17 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Lots of builds are currently failing with:
> 
> 
> 
>      if (strcmp(ShenandoahGCMode, "generational") == 0) {
>                 ^~~~~~~~~~~~~~~~
> 
> The new code in `gcConfiguration.cpp` should actually sense which configurations are available.
> 
> Additional testing:
>  - [x] Linux PPC64 build (as one failing example), now passing
>  - [x] Linux x86_64 `gc/shenandoah/generational` tests

This pull request has now been integrated.

Changeset: a0f436c4
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/shenandoah/commit/a0f436c4
Stats:     3 lines in 1 file changed: 3 ins; 0 del; 0 mod

Fix builds that do not have Shenandoah or other GCs

Reviewed-by: rkennke

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PR: https://git.openjdk.java.net/shenandoah/pull/16