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

8178500: Replace usages of round_to and round_down with align_up and align_down
Reviewed-by: rehn, tschatzl

8180755: Remove use of bitMap.inline.hpp include from instanceKlass.hpp and c1_ValueSet.hpp
Reviewed-by: ehelin, coleenp, dholmes

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

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

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