RFR: Fix shenandoah jdk non-PCH build

[Zhengyu Gu]

>>
>> There are a few changes outside Shenandoah files. Why are they needed?
>> Why are they not needed upstream? Would it make sense to upstream them?
> 
> I wondered the same, and these apparently cover our own additions to those files:
> 
> https://builds.shipilev.net/patch-openjdk-shenandoah-jdk/2018-03-13-v35-vs-02404e27d356/src/hotspot/share/code/debugInfo.cpp.sdiff.html
> 
> https://builds.shipilev.net/patch-openjdk-shenandoah-jdk/2018-03-13-v35-vs-02404e27d356/src/hotspot/share/utilities/growableArray.hpp.sdiff.html

Yep, ok to push?

Thanks,

-Zhengyu


> 
> -Aleksey
>