Do conditional jump based on the second instruction rather than
generate similar assembly code twice.

Bug: 
Change-Id: I8c10f3415f213f88d8222a92671e7104c65befdc
Reviewed-on: https://chromium-review.googlesource.com/634631
Commit-Queue: Jing Bao <jing.bao@intel.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47844}