The parts that deal with allocating on heap buffers and typed array elements
(FixedTypedArrayBase) remain in CSA, as it is assumed to eventually be expressed
with Torque classes.

This reduces overall builtins size by 508 bytes (Mac x64.release)
  - TypedArrayInitialize 2332 -> 1824

Bug: v8:7161
Change-Id: I5d0648b4dd79a687f77d6f4b01b236f4a0508c54
Reviewed-on: https://chromium-review.googlesource.com/c/1445215Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#59337}