INTPTR_PARAMETERS is deduced from reg, which is an TNode<IntPtrT>.

Bug: v8:9708, v8:6949
Change-Id: I84c4e5803602ecc2d9284bce46409a384e93a035
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2212265Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68009}