8029281: Synchronization issues in Logger and LogManager
Summary: Fixes several race conditions in logging which have been at the root cause of intermittent test failures.
Reviewed-by: mchung, plevart
^build/
^dist/
/nbproject/private/
^src/share/tools/hsdis/build/
^src/share/tools/IdealGraphVisualizer/[a-zA-Z0-9]*/build/
^src/share/tools/IdealGraphVisualizer/build/
^src/share/tools/IdealGraphVisualizer/dist/
^.hgtip
.DS_Store