8159045: Remove const from methods returning size_t in threadLocalAllocBuffer.hpp
Reviewed-by: sjohanss, jmasa

8149085: IntegrationTest1.java fails intermittently due to use of semi-initialized TLAB
Reviewed-by: ehelin, mgerdin

8153340: Disallow misconfiguration and improve the consistency of allocation prefetching
Summary: Improve allocation prefetching.
Reviewed-by: kvn

8086053: Address inconsistencies regarding ZeroTLAB
Summary: Add zero-initialization to C1 for fast TLAB refills; strenghten C2 conditions for skipping zero-initialization.
Reviewed-by: kvn, thartmann

8134994: use separate VMStructs databases for SA and JVMCI
Reviewed-by: kbarrett

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