RFR [8]: Fix Minimal VM build

[Roman Kennke]

Yup!

Roman

Am 26.09.18 um 09:57 schrieb Aleksey Shipilev:
> Minimal VM fails to build after recent backports, because Shenandoah flags are not accessible:
> 
> diff -r 2a8e1c939846 src/share/vm/runtime/arguments.cpp
> --- a/src/share/vm/runtime/arguments.cpp	Fri Sep 21 16:00:18 2018 -0400
> +++ b/src/share/vm/runtime/arguments.cpp	Wed Sep 26 09:56:44 2018 +0200
> @@ -1775,11 +1775,13 @@
>    }
>  #endif
> 
> +#if INCLUDE_ALL_GCS
>    if (UseLargePages && (MaxHeapSize / os::large_page_size()) < ShenandoahHeapRegion::MIN_NUM_REGIONS) {
>      warning("Large pages size (" SIZE_FORMAT "K) is too large to afford page-sized regions,
> disabling uncommit",
>              os::large_page_size() / K);
>      FLAG_SET_DEFAULT(ShenandoahUncommit, false);
>    }
> +#endif
> 
>    FLAG_SET_DEFAULT(ParallelGCThreads,
>                     Abstract_VM_Version::parallel_worker_threads());
> 
> 
> Testing: x86 minimal build
> 
> Thanks,
> -Aleksey
>