By using a shared byte buffer on the preparser we can drastically
reduce the number of ZoneChunkLists.

Each PreparseDataBuilder now explicitly keeps track of all inner
builders/functions and writes out the data in consecutive order.

Change-Id: I0aada118d869b150108c1f633d9960474ad2f9a1
Reviewed-on: https://chromium-review.googlesource.com/c/1411600
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58926}