8183552: Move align functions to align.hpp
Reviewed-by: stuefe, pliden

8178499: Remove _ptr_ and _size_ infixes from align functions
Reviewed-by: rehn, tschatzl

8033552: Fix missing missing volatile specifiers in CAS operations in GC code
Summary: Add missing volatile specifiers.
Reviewed-by: kbarrett, tschatzl

8146989: Introduce per-worker preserved mark stacks in ParNew
Summary: Unify and provide per-worker preserved mark stack handling in ParNew
Reviewed-by: tschatzl, ysr

8148951: Remove unused method Generation::performs_in_place_marking()
Reviewed-by: david, jwilhelm

8146690: Make all classes in GC follow the naming convention.
Reviewed-by: dholmes, stefank

8144527: NewSizeThreadIncrease would make an overflow
Summary: Revert to previous value if NewSizeThreadIncrease related calculation overflows
Reviewed-by: jwilhelm, mgerdin, mchernov

8145092: Use Unified Logging for the GC logging
Summary: JEP-271. VM changes contributed by brutisso, test changes contributed by david.
Reviewed-by: sjohanss, david, brutisso
Contributed-by: bengt.rutisson@oracle.com, david.lindholm@oralce.com

8134626: Misc cleanups after generation array removal
Reviewed-by: david, dholmes, tschatzl

8077842: Remove the level parameter passed around in GenCollectedHeap
Reviewed-by: kbarrett, mgerdin

8080112: Replace and remove the last usages of CollectedHeap::n_par_threads()
Reviewed-by: jmasa, kbarrett

8079792: GC directory structure cleanup
Reviewed-by: brutisso, stefank, david