RFR: JDK-8213428: Add a no preocmpiled header Linux build to builds-tier1 and jdk-submit

[Erik Joelsson]

A recent discussion on build-dev brought out the need for jdk-submit to 
include a build with precompiled headers disabled. We currently have 
such builds in builds-tier2, which is not part of jdk-submit. In tier2 
now, we actually build all slowdebug builds without pch, which is 
overkill on platform coverage and not as useful as fastdebug builds.

My suggestion is then to add a specialized linux build of just hotspot, 
fastdebug and disabled pch to builds-tier1 and remove the disabling of 
pch on the slowdebug builds in tier2.

This open part adds the specialized build config to the jib configuration.

Webrev: http://cr.openjdk.java.net/~erikj/8213428/webrev.01/

Bug: https://bugs.openjdk.java.net/browse/JDK-8213428

/Erik