Since fullcodegen was removed, all baseline code runs in Ignition now,
so the code_is_interpreted parameter to FeedbackVector::ComputeCounts
is no longer needed.

Bug: v8:6409
Change-Id: I27842a4978079f8166f22db6c695b352a38e1d87
Reviewed-on: https://chromium-review.googlesource.com/646106Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47748}