Liftoff supports unfixed stack slot sizes now, so we can have
SlotSizeForType return different values based on the value type it is
spilling. We make the change for architectures that support unaligned
access, x64, ia32, arm64.

Note for ppc/s390/mips/mips64 ports: SlotSizeForType remains as 8 byte
(old behavior), but can be changed.

This patch also makes adjustments to PatchPrepareStackFrame to align sp
to appropriate values (pointer size).

Bug: v8:9909
Change-Id: Iddd2dcd652b162a04a02ed704c5b06f6af8a186d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1956165
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65467}