These are almost unused, except for 1 case of Bit, which is probably
incorrect. These static helpers can cause subtle error, e.g.
instr->Bit(1, 3) does not get you bits 1 to 3, but rather calls the
static method Bit(Instr, int).

An example of this bug was fixed in https://crrev.com/c/2157799.

Change-Id: I98c4464c4315af48b9d36472ffd6f16aa74aa18b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2158824Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67315}