Bytecode handlers are technically not builtins, but very similar to CSA
builtins in most respects (CSA-generated code, currently included in the
snapshot and deserialized for every isolate). This prints bytecode
handler sizes (in addition to standard CSA builtin sizes) when
--print-builtin-size is passed.

Bug: 
Change-Id: Ibd78422c5138b77ccf298f97c7c1fc1b73a3a09b
Reviewed-on: https://chromium-review.googlesource.com/581191
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46831}