This CL adds a fast path for DataView getters and setters when the
load or store to be performed is aligned and when the requested
endianness matches the platform endianness.

In that case, we can just emit the right load/store instruction
instead of having to read and write data byte by byte.

Change-Id: I10bd95a7fe8d23f695899eb8173bc654fb38fbb0
Reviewed-on: https://chromium-review.googlesource.com/1106168
Commit-Queue: Théotime Grohens <theotime@google.com>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54005}