This CL doesn't change anything, but builds the infrastructure to inline
selected macros into the Torque IR.

Bug: v8:7793
Change-Id: Icdaa014633edfb314f9263c1a8ad84de4a9e9f97
Reviewed-on: https://chromium-review.googlesource.com/c/1392202
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58502}