and fix platform builtins.

This CL also introduces MacroAssembler::xxx_tagged() operations which
operate on potentially compressed tagged values without doing decompression.

This CL also drive-by fixes compilation failures when pointer compression is
enabled.

Bug: v8:7703
Change-Id: Id417f2a78907e8911aaa79ef404f5bcc87d9a3b8
Reviewed-on: https://chromium-review.googlesource.com/c/1382740Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58352}