Remove redundant jmp in AdvanceBytecodeOffset(), safely add a
couple of {Label::kNear} hint for forward jmp instructions.

Bug: 
Change-Id: Iefc8c1c4656963e7e8a56c5127391e0c508ca401
Reviewed-on: https://chromium-review.googlesource.com/810216
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50155}