Shenandoah build fails without JFR after JDK-8255036

# Reproduce
```
bash configure --with-jvm-variants=server --with-debug-level=fastdebug --with-jvm-features=-jfr
```

# Symptom
```
/home/jvm/jiefu/open/jdk/build/linux-x86_64-server-fastdebug/hotspot/variant-server/libjvm/objs/shenandoahRootVerifier.o: In function `ShenandoahGCStateResetter::ShenandoahGCStateResetter()':
shenandoahRootVerifier.cpp:(.text+0x17): undefined reference to `ShenandoahHeap::heap()'
shenandoahRootVerifier.cpp:(.text+0x27): undefined reference to `ShenandoahHeap::heap()'
shenandoahRootVerifier.cpp:(.text+0x2f): undefined reference to `ShenandoahHeap::is_concurrent_weak_root_in_progress() const'
/home/jvm/jiefu/open/jdk/build/linux-x86_64-server-fastdebug/hotspot/variant-server/libjvm/objs/shenandoahRootVerifier.o: In function `ShenandoahGCStateResetter::~ShenandoahGCStateResetter()':
shenandoahRootVerifier.cpp:(.text+0x5b): undefined reference to `ShenandoahHeap::heap()'
/home/jvm/jiefu/open/jdk/build/linux-x86_64-server-fastdebug/hotspot/variant-server/libjvm/objs/shenandoahRootVerifier.o: In function `ShenandoahRootVerifier::oops_do(OopClosure*)':
shenandoahRootVerifier.cpp:(.text+0x1a6): undefined reference to `ShenandoahHeap::heap()'
shenandoahRootVerifier.cpp:(.text+0x1b6): undefined reference to `ShenandoahHeap::heap()'
shenandoahRootVerifier.cpp:(.text+0x1be): undefined reference to `ShenandoahHeap::is_concurrent_weak_root_in_progress() const'
/home/jvm/jiefu/open/jdk/build/linux-x86_64-server-fastdebug/hotspot/variant-server/libjvm/objs/shenandoahRootVerifier.o: In function `ShenandoahRootVerifier::roots_do(OopClosure*)':
shenandoahRootVerifier.cpp:(.text+0x1083): undefined reference to `ShenandoahHeap::heap()'
shenandoahRootVerifier.cpp:(.text+0x1093): undefined reference to `ShenandoahHeap::heap()'
shenandoahRootVerifier.cpp:(.text+0x109b): undefined reference to `ShenandoahHeap::is_concurrent_weak_root_in_progress() const'
/home/jvm/jiefu/open/jdk/build/linux-x86_64-server-fastdebug/hotspot/variant-server/libjvm/objs/shenandoahRootVerifier.o: In function `ShenandoahRootVerifier::strong_roots_do(OopClosure*)':
```