Enable tracing for "org.eclipse.jdt.core" "debug" + "debug/builder"
example System.out:

saveState took 13977ms: ManyFiles
saveState took 1ms: demo
saveState took 0ms: CreateJava
saveState took 0ms: simple
saving took 13994ms: 4

Change-Id: I1b7d0dcd060dbb46c7683d7b9f10453da1886fa2
Signed-off-by: Joerg Kubitz <jkubitz-eclipse@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.core/+/188921
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Reviewed-by: Andrey Loskutov <loskutov@gmx.de>