preparation for turning off Dataflow Optimizer to speed up optimized compiles (at optimization levels less than 9) * splits -XdisableAggressiveOptimization into five more granular flags * marks -XdisableAggressiveOptimization deprecated * cleans up inconsistency in existing Options and ArgHandler implementations Change-Id: I2f33700566e97672b2e570fc5f75293bd6b2fb9f Review-Link: https://gwt-review.googlesource.com/#/c/2610/ Review by: rluble@google.com git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11604 8db76d5a-ed1c-0410-87a9-c151d255dfc7