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See the associated bug for reasons why this work is happening.

Refactor the version number generator script to be more explicit, and do
away with the hack that was in place to support multiple version numbers
in 64-bit config.

Also, add the new pure 32-bit Mono and Trichrome numbers, as well as an
alias 32_64 version number, which is equivalent to the ambiguous
"Monochrome" version.

Bug: 1027573
Change-Id: Iae270f84ad3cf3c28e9001460a016aa7f75237e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1931100
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718671}