JavaProjectElementInfo.getProjectCache(JavaProject, boolean)

Change-Id: I78112fbd6447d693942a702d5c82bcb544d698b9
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.core/+/165919
Reviewed-by: Stephan Herrmann <stephan.herrmann@berlin.de>
Tested-by: JDT Bot <jdt-bot@eclipse.org>