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* Fixes optimization bug (see linked bug)
* Introduces enum simplification
* Adds command-line support for L8 optimizations

Bug: 1077307
Change-Id: I85e4bba61253c9056d4544cbd849ec0d9bcd97a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210792Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771030}