This change reduces accumulated constant pool size on
Octane2.1 from 296kb (74170 32bit words) to 125 kb (31311
32bit words), a 57.7% reduction.

Bug: v8:8054

Change-Id: I7d6f24dadf9e11b49d028df10970fd0bc6229ad6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1672932Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62328}