RFR: JDK-8173120 Preserve command line at build failure

[Magnus Ihse Bursie]

We have decorated most "typical" build command (such as a Java or native 
compilation) with ExecuteWithLog, which will save the command lines and 
output logs from all commands. It will also move the log files into an 
easy-to-find location.

The command lines used to produce (or to reproduce) a failing command 
should also be moved in tandem.

Bug: https://bugs.openjdk.java.net/browse/JDK-8173120
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8173120-save-failing-command-line/webrev.01

/Magnus