8173335: Improve logging for j.l.ref.reference processing
Summary: Add logs for each phases of references and stats for each worker threads
Reviewed-by: tschatzl, shade

8165455: Tracing events for G1 have incorrect metadata
Reviewed-by: egahlin, tschatzl

8164523: Clean up metadata for event based tracing
Reviewed-by: mlarsson, mgronlun

8157459: G1 IHOP JFR event attribute with incorrect content type
Summary: Use PERCENTAGE instead of BYTES64 data type for the affected attributes.
Reviewed-by: ehelin, sangheki

8143226: Minor updates to Event Based tracing
Reviewed-by: jbachorik, egahlin

8149648: Add number of regions to the G1HeapSummary event
Reviewed-by: sjohanss, jwilhelm

8068394: Trace event for concurrent GC phases
Summary: Add concurrent phase events for CMS and G1
Reviewed-by: brutisso, stefank

8143215: gcc 4.1.2: fix three issues breaking the build.
Summary: Also fix some more recent introduced missing casts.
Reviewed-by: stuefe, simonis, kbarrett, tschatzl

8136679: JFR event for adaptive IHOP
Reviewed-by: tbenson, mgerdin, sangheki, ehelin

8134953: Make the GC ID available in a central place
Reviewed-by: pliden, jmasa

8133530: Add JFR event for evacuation statistics
Summary: Introduce two new JFR events for young/old generation allocation statistics based on previous changes.
Reviewed-by: ehelin, mgerdin

8078901: Add trace event for G1 MMU information
Reviewed-by: ehelin, mlarsson

8025608: GC trace events missing nursery size information
Reviewed-by: sjohanss, mgerdin

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