Inline TransferStackSlot and compare the slots first. This is redundant
if they are different, but in most cases they are the same and doing
this check is beneficial.
Other methods of StackTransferRecipe are not called as often, and
inlining them seems negligible.

R=clemensb@chromium.org

Bug: v8:10576
Change-Id: Ibdaa714e3e40c95a79a0da3ca3170d1da7b62cf3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2249677
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68392}