Two inputs might alias the same node. If one input is assigned
any location before the second input is assigned a register, we
might have two inputs in the node in different locations.

Assigning any location later forces the inputs to point to the
same location (either a register or a stack slot).

Bug: v8:7700
Change-Id: I53e35e5d5afa7e82e2a62a9b0c551b609079c79b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3825886
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Jakob Linke <jgruber@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82395}