This CL moves the DataViewGetFloat32 and DataViewGetFloat64
getters from runtime to Torque.

Change-Id: Ic85ec7bcb4e48f679c24e28121b7c543454e7cde
Reviewed-on: https://chromium-review.googlesource.com/1088919Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Théotime Grohens <theotime@google.com>
Cr-Commit-Position: refs/heads/master@{#53606}