This adds two helper functions in code-generator-{ia32,x64}:

- HasAddressingMode: is the addressing mode not equal to kNone?
- HasRegisterInput: is the specified input in a register?

Bug: v8:9534
Change-Id: I690ee52e247b347a7ef5ba0c98bba47c321ca6b5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1748726
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63157}