Summary: make verification code visible only in debug builds
Reviewed-by: iveresov, ysr, johnc, apetrusenko, tonyp

Reviewed-by: kvn

6459804: Want client (c1) compiler for x86_64 (amd64) for faster start-up
Reviewed-by: kvn

Summary: Update copyright year for files that have been modified in 2008
Reviewed-by: ohair, tbell

Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr

Summary: remove old private plugin interface, simplify, rework old plugin to use unchanged Gnu sources
Reviewed-by: kvn, rasbold