Non-PCH build is broken after JDK-8251560

Multiple failures like:

 /home/buildslave/workspace/jdkX-ci-build/jdkX/src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp: In member function 'virtual void ShenandoahArguments::initialize()':
   /home/buildslave/workspace/jdkX-ci-build/jdkX/src/hotspot/share/gc/shenandoah/shenandoahArguments.cpp:77:100: error: 'vm_exit_during_initialization' was not declared in this scope
        vm_exit_during_initialization("Shenandoah expects ConcGCThreads > 0, check -XX:ConcGCThreads=#");