CheckIf is lowered to DeoptimizeIfNot, but there is no deoptimization
reason given in the deopt if that check fails (the reason is hardcoded
to "no reason"). These deopts are annoying to track down.

This patch makes CheckIf an operator with a DeoptimizeReason parameter,
which is passed through to the DeoptimizeIfNot when lowered.
A couple of checks are converted to give good deoptimize reasons (some
new reasons are introduced), and the others are defaulted to kNoReason
until someone else finds a use for them.

Change-Id: I7e910cc9579ccf978dfe9d270ba7b98c8f6c2492
Reviewed-on: https://chromium-review.googlesource.com/716479Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48506}