TNodify:
 * Equal
 * StrictEqual
 * RelationalComparison

Also TNodify some low hanging Node* in interpreter generator

Bug: v8:6949, v8:9396
Change-Id: I8d6ef775abd10db79cae740e4e26446d7117af25
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1801842Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63753}