RFR: JDK-8165314: Javac server process left running if build fails on Windows

[Erik Joelsson]

Hello,

The symptom of this problem is that if the build fails, quickly fixing 
the issue and rerunning the build will just fail again very early with 
an error message like this:

    make[1]: *** [/cygdrive/d/java/ws/dev/make/Init.gmk:290: main] Error 1
    make[1]: Leaving directory '/cygdrive/d/java/ws/dev'
    make: *** [/cygdrive/d/java/ws/dev/make/Init.gmk:185: 
java.base-only] Error 2

The fix is rather simple. There is a cleanup call to stop the sjavac 
server background process in Init.gmk, but it's only run on successful 
builds and not in the "on-failure" routine. Adding the call to the 
on-failure routine fixes the issue. While at it I also added the build 
time report since I have missed not having it there on failures many times.

Bug: https://bugs.openjdk.java.net/browse/JDK-8165314

Webrev: http://cr.openjdk.java.net/~erikj/8165314/webrev.01/

/Erik