RFR (S): JDK-8025921 Make LOG=debug output more readable

Fri Oct 4 07:29:54 UTC 2013

Bug: https://bugs.openjdk.java.net/browse/JDK-8025921

The primary purpose of the LOG=debug level is to display the actual 
commands run by make.

However, they are often buried in long output lists of filenames, by the 
ListPathsSafely macro and the dependency lists for the SetupArchive 
marco, making it hard to find the relevant output.

The output of these lists are of less relevance, and should be pushed 
down to the more verbose LOG=trace level.

WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8025921-make-LOG-debug-more-readable/webrev.01

/Magnus