Instruction selector is also modified to include a `relaxed`
boolean value to be used for future optimizations.

Change-Id: I1e314066655613846653cc0c3668167c4ef32648
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3735106Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Farazmand <mfarazma@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#81511}