[sgen] Binary protocol entry for card scanning.
[sgen] More information in describe_ptr(), and unify with describe_pointer().
[sgen] Bugfix: When scanning mod table, follow major->major references.
[sgen] Add a missing binary protocol call.
[sgen] Bugfix: Actually sweep blocks when doing concurrent mark.
[sgen] MONO_GC_DEBUG option for checking mark bit consistency.