8147000: VM crashes during initialization trying to print log message
Reviewed-by: kbarrett, dholmes

8065331: Add trace events for failed allocations
Reviewed-by: brutisso, ehelin

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

8139868: CMSScavengeBeforeRemark broken after JDK-8134953
Reviewed-by: sjohanss, jwilhelm

8139293: TestGCEventMixedWithG1ConcurrentMark.java fails after JDK-8134953
Reviewed-by: ecaspole, jwilhelm

8138717: TestGCEventMixedWithG1ConcurrentMark.java fails
Reviewed-by: jwilhelm, david

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

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