8159974: G1 String deduplication logging not aligned with the rest of G1
Reviewed-by: stefank, tschatzl

8159350: G1 String deduplication logging malformed
Reviewed-by: stefank, sjohanss

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

8081202: Hotspot compile warning: "Invalid suffix on literal; C++11 requires a space between literal and identifier"
Summary: Need to add a space between macro identifier and string literal
Reviewed-by: stefank, dholmes, kbarrett

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