8166002: Emulate client build on platforms with reduced virtual address space
Summary: The default VM ergonomics on Windows/x86 (32-bit) are changed to client like.
Reviewed-by: kvn, iveresov

8157560: Reserve space for allocation prefetch only in builds that support allocation prefetching
Summary: Create the reserved area only in C2-enabled builds.
Reviewed-by: kvn, thartmann

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

8152632: Rename LogHandle(...) to Log(...)
Reviewed-by: brutisso, mlarsson, rprotacio

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

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

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