There are a few updates to langtools/make/build.xml for consideration (from Jon):
1. rename:
    build/$MODULE/classes to build/modules/$MODULE
    build/$MODULE/gensrc to build/gensrc/$MODULE

2. there is probably no need to separate gensrc for bootstrap and normal compilation (aren't the outcomes the same?)

3. running jtreg from the build script should use agentvm instead of samevm