Adds a way to tune the optimization level in steps from
draft optimize to full optimization (the current default)

Preliminary testing shows that optimization level '3'
can give almost as good code size results (within 5%)
as full optimization, with about 20% reduction in compile time.

Review at http://gwt-code-reviews.appspot.com/915802


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8887 8db76d5a-ed1c-0410-87a9-c151d255dfc7
4 files changed