This is a partial revert of 438c5eb2 to avoid huge increases in
testing times due to expensive bytecode handler generation in debug
modes. The additional coverage does not warrant a 2x to 3x increase
in testing time at the moment. We can revisit this later.

TBR=rmcilroy@chromium.org
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2445403002
Cr-Commit-Position: refs/heads/master@{#40558}