Added the opcodes kWord32Equal and kChangeTaggedToCompressed to
DecompressionOptimizer.

Currently  TaggedEqual node generates ChangeTaggedToCompressed
nodes before the Word32Equal inputs. This means we need to also
propagate kOnly32BitsObserved from kChangeTaggedToCompressed.

Bug: v8:7703
Change-Id: I61fee07269696c60e065e1bbfee3a65c1b1537fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1871911Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64513}