There are two issues:
1)
./src/hotspot/share/gc/parallel/psParallelCompact.cpp: In static member function 'static void PSParallelCompact::summary_phase(ParCompactionManager*, bool)':
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1615:7: error: 'add_obj_count' was not declared in this scope
       add_obj_count,
       ^~~~~~~~~~~~~
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1616:7: error: 'add_obj_size' was not declared in this scope
       add_obj_size * HeapWordSize);
       ^~~~~~~~~~~~
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1616:7: note: suggested alternative: 'T_INT_size'
       add_obj_size * HeapWordSize);
       ^~~~~~~~~~~~
       T_INT_size
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1620:7: error: 'mark_bitmap_count' was not declared in this scope
       mark_bitmap_count,
       ^~~~~~~~~~~~~~~~~
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1620:7: note: suggested alternative: 'mark_bitmap'
       mark_bitmap_count,
       ^~~~~~~~~~~~~~~~~
       mark_bitmap
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1621:7: error: 'mark_bitmap_size' was not declared in this scope
       mark_bitmap_size * HeapWordSize);
       ^~~~~~~~~~~~~~~~
./src/hotspot/share/gc/parallel/psParallelCompact.cpp:1621:7: note: suggested alternative: 'mark_bitmap'
       mark_bitmap_size * HeapWordSize);
       ^~~~~~~~~~~~~~~~
       mark_bitmap

2)
/home/christian/jdk2/build/linux-x86_64-server-release/hotspot/variant-server/libjvm/objs/scopeDesc.o: In function `ScopeDesc::print_on(outputStream*, PcDesc*) const':
/home/christian/jdk2/./open/src/hotspot/share/code/scopeDesc.cpp:245: undefined reference to `java_lang_Class::as_Klass(oopDesc*)'
/home/christian/jdk2/./open/src/hotspot/share/code/scopeDesc.cpp:245: undefined reference to `java_lang_Class::as_Klass(oopDesc*)'
collect2: error: ld returned 1 exit status
lib/CompileJvm.gmk:141: recipe for target