8064702: Remove the CMS foreground collector Reviewed-by: kbarrett, ysr

Merge

8064581: Move INCLUDE_ALL_GCS include section to the end of the include list Reviewed-by: jwilhelm, brutisso, coleenp, dholmes

8064580: Move INCLUDE_CDS include section to the end of the include list Reviewed-by: jwilhelm, brutisso, coleenp, dholmes

8064473: Improved handling of age during object copy in G1 Reviewed-by: brutisso, tschatzl

8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs Summary: Read _top before _gc_time_stamp in saved_mark_word() with LoadLoad order to ensure we get a consistent view Reviewed-by: brutisso, dcubed, dholmes, stefank

8064811: Use THREAD instead of CHECK_NULL in return statements Reviewed-by: coleenp, simonis, dholmes

8064786: Fix debug build after 8062808: Turn on the -Wreturn-type warning Reviewed-by: stefank, tschatzl

8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes Summary: Suppress gc_alot during VM init, improve error for SLT uninitialized. Reviewed-by: jmasa, brutisso, tschatzl

8062808: Turn on the -Wreturn-type warning Reviewed-by: mgerdin, tschatzl, coleenp, jrose, kbarrett

Merge

8065346: WB_AddToBootstrapClassLoaderSearch calls JvmtiEnv::create_a_jvmti when not in _thread_in_vm state Summary: Removed ThreadToNativeFromVM and use java_lang_String::as_utf8_string instead Reviewed-by: dholmes, minqi